| H. C. Marston Morse | |
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Marston Morse in 1965 (courtesy MFO)
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| Born | 24 March 1892 Waterville, Maine |
| Died | 22 June 1977 (aged 85) Princeton, New Jersey |
| Nationality | American |
| Fields | Mathematics |
| Institutions | Harvard University |
| Alma mater | Colby College Harvard University |
| Doctoral advisor | G. D. Birkhoff |
| Doctoral students | Emilio Baiada Arthur B. Brown Gustav Hedlund Walter Leighton Sumner Myers |
| Known for | Morse theory |
Harold Calvin Marston Morse (24 March 1892 – 22 June 1977) was an American mathematician best known for his work on the calculus of variations in the large, a subject where he introduced the technique of differential topology now known as Morse theory. In 1933 he was awarded the Bôcher Memorial Prize for his work in mathematical analysis.
He was born in Waterville, Maine to Ella Phoebe Marston and Howard Calvin Morse in 1892. He received his bachelor's degree from Colby College (also in Waterville) in 1914. At Harvard University, he received both his master's degree in 1915 and his Ph.D. in 1917.
He taught at Harvard, Brown, and Cornell Universities before accepting a position in 1935 at the Institute for Advanced Study in Princeton, where he remained until his retirement in 1962.
He spent most of his career on a single subject, eponymously titled Morse Theory, a branch of differential topology. Morse Theory is a very important subject in modern mathematical physics, such as string theory.