__NOTOC__ Joseph Leonard Walsh (September 21, 1895 – December 6, 1973) was an American mathematician who worked mainly in the field of analysis. The Walsh function and the Walsh–Hadamard code are named after him. The Grace–Walsh–Szegő coincidence theorem is important in the study of the location of the zeros of multivariate polynomials. He became a member of the

National Academy of Sciences The National Academy of Sciences (NAS) is a United States nonprofit, non-governmental organization. NAS is part of the National Academies of Sciences, Engineering, and Medicine, along with the National Academy of Engineering (NAE) and the Nati ...

in 1936 and served 1949–51 as president of the American Mathematical Society. Altogether he published 279 articles (research and others) and seven books, and advised 31 PhD students. For most of his professional career he studied and worked at Harvard University. He received a B.S. in 1916 and a PhD in 1920. The Advisor of his PhD was Maxime Bôcher. Walsh started to work as lecturer in Harvard afterwards and became a full professor in 1935. He was an Invited Speaker of the ICM in 1920 at Strasbourg. With two different scholarships he was able to study in Paris under Paul Montel (1920–21) and in Munich under Constantin Carathéodory (1925–26). From 1937 to 1942 he served as chairman of his department at Harvard. During World War II he served as an officer in the US navy and was promoted to captain right after end of the war. After his retirement from Harvard in 1966 he accepted a position at the University of Maryland where he continued to work up to a few months before his death.

Works

Articles

* * * with Wladimir Seidel: * with T. S. Motzkin: * with J. P. Evans: * with Lawrence Rosenfeld: * * with J. H. Ahlberg & E. N. Nilson: * with J. H. Ahlberg & E. N. Nilson: * with J. H. Ahlberg & E. N. Nilson:

Books

''Interpolation and approximation by rational functions in the complex domain''
AMS Colloquium Publications 1935, 5th edn. 1969
''The location of critical points of analytic and harmonic functions''
AMS Colloquium Publications, vol. 34, 1950 * with John Harold Ahlberg, Edwin Norman Nilson: ''The theory of splines and their applications'', Academic Press 1967,

References

Additional sources

* * * Morris Marden:
''Joseph L. Walsh in Memoriam''
Bulletin of the American Mathematical Society, Volume 81, issue 1, January 1975 * {{DEFAULTSORT:Walsh, Joseph Leonard 1895 births 1973 deaths 20th-century American mathematicians Harvard University alumni Harvard University faculty Members of the United States National Academy of Sciences Presidents of the American Mathematical Society Mathematicians from Washington, D.C.