Arthur Thomas Ippen (July 28, 1907 – April 5, 1974) was a noted

hydrologist Hydrology () is the scientific study of the movement, distribution, and management of water on Earth and other planets, including the water cycle, water resources, and environmental watershed sustainability. A practitioner of hydrology is calle ...

and

engineer Engineers, as practitioners of engineering, are professionals who invent, design, analyze, build and test machines, complex systems, structures, gadgets and materials to fulfill functional objectives and requirements while considering the limit ...

and was an

Institute Professor An institute is an organisational body created for a certain purpose. They are often research organisations (research institutes) created to do research on specific topics, or can also be a professional body. In some countries, institutes can ...

at the

Massachusetts Institute of Technology 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 ...

. Born to German parents, he attended high school and college in

Aachen, Germany Aachen ( ; ; Aachen dialect: ''Oche'' ; French and traditional English: Aix-la-Chapelle; or ''Aquisgranum''; nl, Aken ; Polish: Akwizgran) is, with around 249,000 inhabitants, the 13th-largest city in North Rhine-Westphalia, and the 28th- ...

graduating with a degree in Civil Engineering in 1931. He then took an

Institute of International Education The Institute of International Education (IIE) is a 501(c) organization which focuses on international student exchange and aid, foreign affairs, and international peace and security. IIE creates programs of study and training for students, educa ...

scholarship to study at the

University of Iowa The University of Iowa (UI, U of I, UIowa, or simply Iowa) is a public research university in Iowa City, Iowa, United States. Founded in 1847, it is the oldest and largest university in the state. The University of Iowa is organized into 12 col ...

but after his doctoral advisor, Floyd Nagler, died suddenly, Ippen transferred to

Caltech The California Institute of Technology (branded as Caltech or CIT)The university itself only spells its short form as "Caltech"; the institution considers other spellings such a"Cal Tech" and "CalTech" incorrect. The institute is also occasional ...

to complete his Ph.D. His doctoral work, supervised by

Theodore von Kármán Theodore von Kármán ( hu, ( szőllőskislaki) Kármán Tódor ; born Tivadar Mihály Kármán; 11 May 18816 May 1963) was a Hungarian-American mathematician, aerospace engineer, and physicist who was active primarily in the fields of aeronaut ...

and Robert T. Knapp, explored sediment transport and open-channel high-velocity flows and represented the first American development of sonic wave analogy to free-surface flow. Ippen's took his first faculty appointment at

Lehigh University Lehigh University (LU) is a private research university in Bethlehem, Pennsylvania in the Lehigh Valley region of eastern Pennsylvania. The university was established in 1865 by businessman Asa Packer and was originally affiliated with the Epi ...

in 1938 and remained there until he accepted a position at

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 ...

in 1945. While at MIT, he took over the existing Hydrodynamics Laboratory and built up a research program of staff graduate students examining the sonic analogy,

transient flow In physics and engineering, fluid dynamics is a subdiscipline of fluid mechanics that describes the flow of fluids— liquids and gases. It has several subdisciplines, including ''aerodynamics'' (the study of air and other gases in motion) an ...

s, instrumentation,

turbulence In fluid dynamics, turbulence or turbulent flow is fluid motion characterized by chaotic changes in pressure and flow velocity. It is in contrast to a laminar flow, which occurs when a fluid flows in parallel layers, with no disruption between ...

, cavitation, shoaling waves, stratified flow, and sediment transport. The laboratory eventually expanded and became the Ralph M. Parsons Laboratory for Water Resources and Hydrodynamics. Ippen served as the President of the International Association for Hydraulic Research, was elected to the

National Academy of Engineering The National Academy of Engineering (NAE) is an American nonprofit, non-governmental organization. The National Academy of Engineering is part of the National Academies of Sciences, Engineering, and Medicine, along with the National Academy of ...

in April 1967 and 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 ...

, and also received honorary doctorates from the

University of Toulouse The University of Toulouse (french: Université de Toulouse) was a university in the French city of Toulouse that was established by papal bull in 1229, making it one of the earliest universities to emerge in Europe. Suppressed during the Frenc ...

University of Karlsruhe The Karlsruhe Institute of Technology (KIT; german: Karlsruher Institut für Technologie) is a public research university in Karlsruhe, Germany. The institute is a national research center of the Helmholtz Association. KIT was created in 2009 w ...

, and the

University of Manchester , mottoeng = Knowledge, Wisdom, Humanity , established = 2004 – University of Manchester Predecessor institutions: 1956 – UMIST (as university college; university 1994) 1904 – Victoria University of Manchester 1880 – Victoria Univ ...

. He married Elisabeth Wagenplatz while at Caltech and had two children, Erich Peter and Karin Ann. Erich P. Ippen is a professor of electrical engineering and physics at MIT and a fellow member of the National Academy of Engineering. Elisabeth died in 1953 and Ippen married Ruth Calvert in 1955.

References

* 20th-century American educators 20th-century American engineers Hydraulic engineers University of Iowa alumni Lehigh University faculty Massachusetts Institute of Technology faculty 1907 births 1974 deaths British expatriates in Germany British emigrants to the United States {{US-academic-scientist-stub