Roger R. Revelle
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Roger Randall Dougan Revelle (March 7, 1909 – July 15, 1991) was a scientist and scholar who was instrumental in the formative years of the
University of California, San Diego The University of California, San Diego (UC San Diego or colloquially, UCSD) is a public land-grant research university in San Diego, California. Established in 1960 near the pre-existing Scripps Institution of Oceanography, UC San Diego is t ...
and was among the early scientists to study anthropogenic
global warming In common usage, climate change describes global warming—the ongoing increase in global average temperature—and its effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes to E ...
, as well as the movement of Earth's
tectonic plates Plate tectonics (from the la, label=Late Latin, tectonicus, from the grc, τεκτονικός, lit=pertaining to building) is the generally accepted scientific theory that considers the Earth's lithosphere to comprise a number of large ...
. UC San Diego's first college is named
Revelle College Revelle College is the oldest residential college at the University of California, San Diego in La Jolla, California. Founded in 1964, it is named after oceanographer and UC San Diego founder Roger Revelle. UC San Diego—along with Revelle Col ...
in his honor.


Career

Roger Revelle was born in
Seattle Seattle ( ) is a seaport city on the West Coast of the United States. It is the seat of King County, Washington. With a 2020 population of 737,015, it is the largest city in both the state of Washington and the Pacific Northwest regio ...
to William Roger Revelle and Ella Dougan. He grew up in southern California. After graduating from
Pomona College Pomona College ( ) is a private liberal arts college in Claremont, California. It was established in 1887 by a group of Congregationalists who wanted to recreate a "college of the New England type" in Southern California. In 1925, it became t ...
in 1929 with early studies in
geology Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Ea ...
, he earned a PhD in oceanography from the
University of California, Berkeley The University of California, Berkeley (UC Berkeley, Berkeley, Cal, or California) is a public land-grant research university in Berkeley, California. Established in 1868 as the University of California, it is the state's first land-grant u ...
in 1936. While at Cal, he studied under
George Louderback George Davis Louderback (April 6, 1874 – January 27, 1957) was an American geologist, known for identifying and describing benitoite and joaquinite. Biography Louderback was born in San Francisco, and received an A.B. from the University of ...
and was initiated into Theta Tau Professional Engineering Fraternity, which started as a mining engineering fraternity and maintained a strong affinity for geology and geological engineering students. Much of his early work in oceanography took place at the Scripps Institution of Oceanography (SIO) in
San Diego San Diego ( , ; ) is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United State ...
. He was also oceanographer for the Navy during WWII. He was director of SIO from 1950 to 1964. He stood against the UC faculty being required to take an anti-communist oath during the Joseph McCarthy period. He served as Science Advisor to Interior Secretary Stewart Udall during the Kennedy Administration in the early 1960s and was president of the American Association for the Advancement of Science (1974).


Growth of oceanography

Revelle was deeply involved in the growth of oceanography in the United States and internationally after World War II. Working for the Navy in the late 1940s, he helped to determine which projects gained funding. He also promoted the idea that the Navy ought to support "basic research" instead of only trying to build new technology. At Scripps he launched several major long-range expeditions in the 1950s, including the MIDPAC, TRANSPAC (with Canada and Japan), EQUAPAC, and NORPAC, each traversing a different part of the Pacific Ocean. He and other scientists at Scripps Institution of Oceanography helped the U.S. government to plan
nuclear weapons tests Nuclear weapons tests are experiments carried out to determine nuclear weapons' effectiveness, yield, and explosive capability. Testing nuclear weapons offers practical information about how the weapons function, how detonations are affected b ...
, in the hope that oceanographers might make use of the data. Revelle was one of the committee chairmen in the influential National Academy of Sciences studies of the biological effects of atomic radiation (BEAR), the results of which were published in 1956. In 1952, along with Dr. Seibert Q. Duntley, he successfully moved the
MIT The Massachusetts Institute of Technology (MIT) is a private land-grant research university in Cambridge, Massachusetts. Established in 1861, MIT has played a key role in the development of modern technology and science, and is one of the m ...
Visibility Lab to SIO with financial support of the U.S. Navy. Along with oceanographers at the
Woods Hole Oceanographic Institution The Woods Hole Oceanographic Institution (WHOI, acronym pronounced ) is a private, nonprofit research and higher education facility dedicated to the study of marine science and engineering. Established in 1930 in Woods Hole, Massachusetts, it ...
, Revelle planned the American contributions to the oceanographic program of the International Geophysical Year (IGY). He became the first president of the
Scientific Committee on Oceanic Research The Scientific Committee on Oceanic Research (SCOR) is an interdisciplinary body of the International Science Council. SCOR was established in 1957, coincident with the International Geophysical Year of 1957-1958. It sought to bring scientists t ...
, an international group of scientists devoted to advising on international projects, and was a frequent adviser to the
Intergovernmental Oceanographic Commission The Intergovernmental Oceanographic Commission of UNESCO (IOC/UNESCO) was established by resolution 2.31 adopted by the General Conference of UNESCO. It first met in Paris at Unesco Headquarters from 19 to 27 October 1961. Initially, 40 States becam ...
, created in 1960.


Global warming

Revelle was instrumental in creating the International Geophysical Year (IGY) in 1958 and was founding chairman of the first Committee on Climate Change and the Ocean (CCCO) under the Scientific Committee on Ocean Research (SCOR) and the International Oceanic Commission (IOC). During planning for the IGY, under Revelle's directorship, SIO participated in and later became the principal center for the Atmospheric Carbon Dioxide Program. In July 1956,
Charles David Keeling Charles David Keeling (April 20, 1928 – June 20, 2005) was an American scientist whose recording of carbon dioxide at the Mauna Loa Observatory confirmed Svante Arrhenius's proposition (1896) of the possibility of anthropogenic contribution to ...
joined the SIO staff to head the program and began measurements of atmospheric carbon dioxide at the
Mauna Loa Observatory The Mauna Loa Observatory (MLO) is an atmospheric baseline station on Mauna Loa, on the island of Hawaii, located in the U.S. state of Hawaii. The observatory Since 1958, initially under the direction of Charles Keeling, followed by his s ...
on
Mauna Loa Mauna Loa ( or ; Hawaiian: ; en, Long Mountain) is one of five volcanoes that form the Island of Hawaii in the U.S. state of Hawaii in the Pacific Ocean. The largest subaerial volcano (as opposed to subaqueous volcanoes) in both mass and ...
, Hawaii, and in Antarctica.
Hans Suess Hans Eduard Suess (December 16, 1909 – September 20, 1993) was an Austrian born American physical chemist and nuclear physicist. He was a grandson of the Austrian geologist Eduard Suess. Career Suess earned his Ph.D. in chemistry from the U ...
was recruited by Revelle, and they co-authored a 1957 article using carbon-14 isotope levels to assess the rate at which
carbon dioxide Carbon dioxide ( chemical formula ) is a chemical compound made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in the gas state at room temperature. In the air, carbon dioxide is trans ...
added by fossil fuel combustion since the start of the industrial revolution had accumulated in the atmosphere. They concluded that most of it had been absorbed by the Earth's oceans, contrary to the assumption made by early geoscientists (
Chamberlin The Chamberlin is an electro-mechanical keyboard instrument that was a precursor to the Mellotron. It was developed and patented by the American inventor Harry Chamberlin from 1949 to 1956, when the first model was introduced. There are several ...
, Arhenius and
Callendar Callendar is a title of Scottish nobility and a surname. It may refer to: * Earl of Callendar ** Callendar House, Falkirk * Guy Stewart Callendar (1898 – 1964), English steam engineer and inventor and son of Hugh Longbourne Callendar ** Callendar ...
) that it would simply accumulate in the upper atmosphere to "lower the mean level of back radiation in the infrared and thereby increase the average temperature near the Earth's surface". There had been little sign to date of this
greenhouse effect The greenhouse effect is a process that occurs when energy from a planet's host star goes through the planet's atmosphere and heats the planet's surface, but greenhouse gases in the atmosphere prevent some of the heat from returning directly ...
causing the anticipated warming, but the Suess–Revelle article suggested that increasing human gas emissions might change this. They said that "human beings are now carrying out a large scale geophysical experiment of a kind that could not have happened in the past nor be reproduced in the future". (Manuscript received September 4, 1956). Revelle told journalists about the issues and testified to Congress that "The Earth itself is a space ship", endangered by rising seas and desertification. A November 1957 report in ''
The Hammond Times ''The Times of Northwest Indiana'' (NWI) is a daily newspaper headquartered in Munster, Indiana. It is the second-largest newspaper in Indiana, behind only ''The Indianapolis Star''. History The paper was founded on June 18, 1906, as ''The Lake ...
'' described his research as suggesting that "a large scale global warming, with radical climate changes may result" – the first use of the term ''
global warming In common usage, climate change describes global warming—the ongoing increase in global average temperature—and its effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes to E ...
''. See als
footnote 27
A biographer of Suess later said that, although other articles in the same journal discussed carbon-dioxide levels, the Suess–Revelle article was "the only one of the three to stress the growing quantity of contributed by our burning of fossil fuel, and to call attention to the fact that it might cause global warming over time".Waenke, Heinrich, and Arnold, James R., (2005)
Hans E. Suess, A biographical Memoir
, pp. 363–364.
Revelle and Suess described the "buffer factor", now known as the "
Revelle factor The Revelle factor (buffer factor) is the ratio of instantaneous change in carbon dioxide () to the change in total dissolved inorganic carbon (DIC), and is a measure of the resistance to atmospheric CO2 being absorbed by the ocean surface layer. T ...
", which is a resistance to
atmospheric carbon dioxide Carbon dioxide in Earth's atmosphere is a trace gas that plays an integral part in the greenhouse effect, carbon cycle, photosynthesis and oceanic carbon cycle. It is one of several greenhouse gases in Earth's atmosphere that are contributin ...
being absorbed by the ocean surface layer posed by bicarbonate chemistry. Essentially, in order to enter the ocean, carbon dioxide gas has to partition into one of the components of carbonic acid: carbonate ion, bicarbonate ion, or protonated carbonic acid, and the product of these many chemical dissociation constants factors into a kind of back-pressure that limits how fast the carbon dioxide can enter the surface ocean. Geology,
geochemistry Geochemistry is the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth's crust and its oceans. The realm of geochemistry extends beyond the Earth, encompassing the ...
,
atmospheric chemistry Atmospheric chemistry is a branch of atmospheric science in which the chemistry of the Earth's atmosphere and that of other planets is studied. It is a multidisciplinary approach of research and draws on environmental chemistry, physics, meteorol ...
,
ocean chemistry Marine chemistry, also known as ocean chemistry or chemical oceanography, is influenced by plate tectonics and seafloor spreading, turbidity currents, sediments, pH levels, atmospheric constituents, metamorphic activity, and ecology. The fie ...
... this amounted to one of the earliest examples of "integrated assessment", which 50 years later became an entire branch of global-warming science. In the November 1982 ''Scientific American'' Letters to the Editors, Revelle stated: "We must conclude that until a warming trend that exceeds the noise level of natural climatic fluctuations becomes clearly evident, there will be considerable uncertainty and a diversity of opinions about the amplitude of the climatic effects of increased atmospheric CO2. If the modelers are correct, such a signal should be detectable within the next 10 or 15 years."


UC San Diego

During the late 1950s, Revelle fought for the establishment of a
University of California The University of California (UC) is a public land-grant research university system in the U.S. state of California. The system is composed of the campuses at Berkeley, Davis, Irvine, Los Angeles, Merced, Riverside, San Diego, San Franci ...
campus in San Diego. He had to contend with the UC Board of Regents, who would have preferred merely to expand the
University of California, Los Angeles The University of California, Los Angeles (UCLA) is a public land-grant research university in Los Angeles, California. UCLA's academic roots were established in 1881 as a teachers college then known as the southern branch of the California S ...
campus rather than create an entirely new campus in San Diego. He also came into conflict with San Diego politicians and businessmen who believed that the campus should be established closer to downtown, such as near
San Diego State University San Diego State University (SDSU) is a public research university in San Diego, California. Founded in 1897 as San Diego Normal School, it is the third-oldest university and southernmost in the 23-member California State University (CSU) system ...
or in Balboa Park. The decision to build the campus at
La Jolla La Jolla ( , ) is a hilly, seaside neighborhood within the city of San Diego, California, United States, occupying of curving coastline along the Pacific Ocean. The population reported in the 2010 census was 46,781. La Jolla is surrounded on ...
was made in 1959, and the first graduate students were enrolled in 1960, followed by the first undergraduates in 1964. Revelle's struggle to acquire land for the new campus put him in competition with
Jonas Salk Jonas Edward Salk (; born Jonas Salk; October 28, 1914June 23, 1995) was an American virologist and medical researcher who developed one of the first successful polio vaccines. He was born in New York City and attended the City College of New ...
, and Revelle lost some of what he called the "best piece of land we had" on UCSD's eventual Torrey Pines site to the fledgling
Salk Institute The Salk Institute for Biological Studies is a scientific research institute located in the La Jolla community of San Diego, California, U.S. The independent, non-profit institute was founded in 1960 by Jonas Salk, the developer of the polio vacci ...
. In later years Revelle continued to show some animosity toward Salk, once saying: "He is a folk hero, even though he is... not very bright." When at Scripps and while building UCSD, Revelle also had to deal with a La Jolla community that refused to rent or sell property to Jews. In addition to battling the anti-semitic restrictive covenants of La Jolla real estate, Revelle helped found a new housing subdivision for Scripps professors, partially because some of them would not have been allowed to live in La Jolla. Unfortunately, Revelle's tactless approaches to these public battles earned him many enemies, who portrayed him to the Board of Regents as too "disorganized" to effectively lead UCSD. UC President
Clark Kerr Clark Kerr (May 17, 1911 – December 1, 2003) was an American professor of economics and academic administrator. He was the first chancellor of the University of California, Berkeley, and twelfth president of the University of California. B ...
realized that Revelle was not a viable candidate to serve as the first chancellor of the new campus, and delivered the news to a "heartbroken" Revelle. In his memoirs, Kerr paraphrased Revelle's response: "He spoke of how he had walked the site of the prospective campus on moonlit nights visualizing what one day might rise there in all its splendor. I shared a few very sad moments with him." Instead of Revelle,
Herbert York Herbert Frank York (24 November 1921 – 19 May 2009) was an American nuclear physicist of Mohawk origin.http://www.edge.org/conversation/nsa-the-decision-problem. The Decision Problem He held numerous research and administrative positions ...
became the first chancellor of UCSD. Revelle left Scripps in 1963 and founded the (now defunct
Center for Population Studies
at
Harvard University Harvard University is a private Ivy League research university in Cambridge, Massachusetts. Founded in 1636 as Harvard College and named for its first benefactor, the Puritan clergyman John Harvard, it is the oldest institution of high ...
. In his over ten years there as its Director, he focused upon the application of science and technology to the problem of world hunger. In 1976 he returned to UC San Diego as Professor of Science, Technology and Public Affairs (STPA) in the school's
political science Political science is the scientific study of politics. It is a social science dealing with systems of governance and power, and the analysis of political activities, political thought, political behavior, and associated constitutions and la ...
department.


Views on climate change distorted

In 1991, Revelle's name appeared as co-author on an article written by physicist S. Fred Singer and electrical engineer Chauncey Starr for the publication '' Cosmos: A Journal of Emerging Issues'', titled "What to do about greenhouse warming: Look before you leap", which was published in the summer of 1992. The Cosmos article included the statement that "Drastic, precipitous—and, especially, unilateral—steps to delay the putative greenhouse impacts can cost jobs and prosperity and increase the human costs of global poverty, without being effective. Stringent economic controls now would be economically devastating particularly for developing countries...". The article concluded: "The scientific base for a greenhouse warming is too uncertain to justify drastic action at this time. There is little risk in delaying policy responses." These particular statements and the bulk of the article, including the title, had been written and published a year earlier by S. Fred Singer as sole author. Singer's article stated that "there is every expectation that scientific understanding will be substantially improved within the next decade" and advocated against ''drastic'' and "hastily-conceived" action at the time without further scientific evidence. It does not, however, deny climate change or global warming. Justin Lancaster, Revelle's graduate student and teaching assistant at the Scripps Institution of Oceanography from 1981 until Revelle's death, says that Revelle was "hoodwinked" by Singer into adding his name to the article and that Revelle was "intensely embarrassed that his name was associated" with it.The Cosmos Myth
In 1992, Lancaster charged that Singer's actions were "unethical" and specifically designed to undercut then–Senator
Al Gore Albert Arnold Gore Jr. (born March 31, 1948) is an American politician, businessman, and environmentalist who served as the 45th vice president of the United States from 1993 to 2001 under President Bill Clinton. Gore was the Democratic no ...
's global warming policy stance; however, to end a lawsuit brought by Singer against Lancaster with support of the Center for Public Interest in Washington, D.C., Lancaster gave Singer a statement of apology, but refused to agree that anything he said was false. In 2006, prompted by Robert Balling and others continuing to state that Revelle actually wrote the article, Lancaster formally withdrew his retraction and reiterated his charges. When Gore was running for the vice-presidential nomination in 1992, ''
The New Republic ''The New Republic'' is an American magazine of commentary on politics, contemporary culture, and the arts. Founded in 1914 by several leaders of the progressive movement, it attempted to find a balance between "a liberalism centered in hu ...
'' picked up on the contrast between the references to Revelle in Gore's book ''
Earth in the Balance ''Earth in the Balance: Ecology and the Human Spirit'' (, paperback ) is a 1992 book written by Al Gore, published in June 1992, shortly before he was elected Vice President in the 1992 presidential election. Known by the short title ''Earth i ...
'' and the views in the ''Cosmos'' article that could now be attributed to Revelle. This was followed up by ''Newsweek'' and elsewhere in the media. Patrick Michaels boasted that the ''Cosmos'' article had been read into the Congressional Record. The issue was even raised by Admiral
James Stockdale James Bond "Jim" Stockdale (December 23, 1923 – July 5, 2005) was a United States Navy vice admiral and aviator, awarded the Medal of Honor in the Vietnam War, during which he was a prisoner of war for over seven years. Stockdale was the mos ...
in the televised vice-presidential debate. Gore's response was to protest that Revelle's views in the article had been taken out of context. Roger's daughter, Carolyn Revelle, wrote:
Contrary to
George Will George Frederick Will (born May 4, 1941) is an American libertarian-conservative political commentator and author. He writes regular columns for ''The Washington Post'' and provides commentary for NBC News and MSNBC. Gold, Hadas (May 8, 2017)." ...
's "Al Gore's Green Guilt", Roger Revelle—our father and the "father" of the greenhouse effect—remained deeply concerned about global warming until his death in July 1991. That same year he wrote: "The scientific base for a greenhouse warming is too uncertain to justify drastic action at this time." Will and other critics of Sen. Al Gore have seized these words to suggest that Revelle, who was also Gore's professor and mentor, renounced his belief in global warming. Nothing could be further from the truth. When Revelle inveighed against "drastic" action, he was using that adjective in its literal sense—measures that would cost trillions of dollars. Up until his death, he thought that extreme measures were premature. But he continued to recommend immediate prudent steps to mitigate and delay climatic warming. Some of those steps go well beyond anything Gore or other national politicians have yet to advocate. ..Revelle proposed a range of approaches to address global warming. Inaction was not one of them. He agreed with the adage "look before you leap", but he never said "sit on your hands".


Legacy

During his last decade at UCSD and SIO, Revelle continued to work and teach. In the early 1980s, he taught undergraduate STPA seminars twice a year, in Energy and Development (mainly on problems in Africa), the Carbon Dioxide Problem (known now as the
Global Warming In common usage, climate change describes global warming—the ongoing increase in global average temperature—and its effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes to E ...
problem), and Marine Policy. In 1986 he won the Balzan Prize for Oceanography/Climatology. A 1990 heart attack forced him to move his course to the Scripps Institution from the Revelle College provost's office, where he continued to teach the Marine Policy program until his death the following year. In 1991, he was awarded the
National Medal of Science The National Medal of Science is an honor bestowed by the President of the United States to individuals in science and engineering who have made important contributions to the advancement of knowledge in the fields of behavioral and social scienc ...
by President George H. W. Bush (one of about 500 recipients in the 20th century). He remarked to a reporter: "I got it for being the grandfather of the greenhouse effect." Revelle died in San Diego on July 15, 1991, from complications of cardiac arrest. He was survived by his wife, Ellen Clark Revelle (1910–2009), three daughters, Anne Shumway, Mary Paci, and Carolyn Revelle, and one son,
William William is a male given name of Germanic origin.Hanks, Hardcastle and Hodges, ''Oxford Dictionary of First Names'', Oxford University Press, 2nd edition, , p. 276. It became very popular in the English language after the Norman conquest of Engl ...
, as well as numerous grandchildren. In his honor, a new research vessel at the Scripps Institution was named '' R/V Roger Revelle''. Also, the Ocean Studies Board of the National Academies of Sciences, Engineering, and Medicine created the Roger Revelle Commemorative Lecture series in memory of Revelle in 1999, featuring distinguished speakers on the themes of ocean science and public policy. Since 1992, the
American Geophysical Union The American Geophysical Union (AGU) is a 501(c)(3) nonprofit organization of Earth, atmospheric, ocean, hydrologic, space, and planetary scientists and enthusiasts that according to their website includes 130,000 people (not members). AGU's a ...
has annually awarded a prize in his honor, the
Roger Revelle Medal The Roger Revelle Medal is given out annually by the American Geophysical Union to recognize "outstanding accomplishments or contributions toward the understanding of the Earth’s atmospheric processes, including its dynamics, chemistry, and r ...
, for outstanding contributions in atmospheric sciences.


Awards and honors

* Elected to the United States National Academy of Sciences (1957) * Elected to the
American Academy of Arts and Sciences The American Academy of Arts and Sciences (abbreviation: AAA&S) is one of the oldest learned societies in the United States. It was founded in 1780 during the American Revolution by John Adams, John Hancock, James Bowdoin, Andrew Oliver, a ...
(1958) * Elected to the
American Philosophical Society The American Philosophical Society (APS), founded in 1743 in Philadelphia, is a scholarly organization that promotes knowledge in the sciences and humanities through research, professional meetings, publications, library resources, and communit ...
(1960) *
Alexander Agassiz Medal The Alexander Agassiz Medal is awarded every three years by the U.S. National Academy of Sciences for an original contribution in the science of oceanography. It was established in 1911 by Sir John Murray in honor of his friend, the scientist Ale ...
(1963) *
William Bowie Medal The William Bowie Medal is awarded annually by the American Geophysical Union for "outstanding contributions to fundamental geophysics and for unselfish cooperation in research". The award is the highest honor given by the AGU and is named in honor ...
(1968) *
Tyler Prize for Environmental Achievement The Tyler Prize for Environmental Achievement is an annual award for environmental science, environmental health, and energy. Tyler Laureates receive a $200,000 cash prize and a medallion. The prize is administered by the University of Southern Cal ...
(1984) *
Vannevar Bush Award The National Science Board established the Vannevar Bush Award ( ) in 1980 to honor Vannevar Bush's unique contributions to public service. The annual award recognizes an individual who, through public service activities in science and technolog ...
(1984) * Golden Plate Award of the
American Academy of Achievement The American Academy of Achievement, colloquially known as the Academy of Achievement, is a non-profit educational organization that recognizes some of the highest achieving individuals in diverse fields and gives them the opportunity to meet ...
(1985) *
National Medal of Science The National Medal of Science is an honor bestowed by the President of the United States to individuals in science and engineering who have made important contributions to the advancement of knowledge in the fields of behavioral and social scienc ...
(1990)


References


External links


NASA Roger Revelle BiographyRevelle College 40th AnniversaryResearch Vessel ''Roger Revelle'' at Scripps Institution of OceanographyRoger Revelle, a profile
Judith & Neil Morgan *
Scripps Institution of Oceanography
{{DEFAULTSORT:Revelle, Roger 1909 births 1991 deaths American earth scientists American oceanographers American political scientists National Medal of Science laureates Scientists from Seattle Pomona College alumni University of California, Berkeley alumni Scripps Institution of Oceanography faculty University of California, San Diego faculty University of California, San Diego people Vannevar Bush Award recipients Presidents of the American Association for the Advancement of Science Members of the American Philosophical Society 20th-century political scientists