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Ralph Belknap Baldwin
Ralph Belknap Baldwin (June 6, 1912 – October 23, 2010)〔''Who's Who in America'' (). 56th edition, 2002. New Providence, NJ: Marquis Who's Who, 2001.〕 was an American planetary scientist known for his work on lunar craters, beginning in the late 1940s. His book, ''The Face of the Moon''〔Baldwin, Ralph Belknap. 1949. ''The Face of the Moon''. (): Univ. of Chicago Press〕 made the case for the impact nature of lunar craters. He published ''The Measure of the Moon'' in 1963.〔Baldwin, Ralph Belknap. 1963. ''The Measure of the Moon''. (): Univ. of Chicago Press. 508pp. ISBN 978-0226036069〕
Prior to his lunar work he was Senior Physicist at Johns Hopkins University's Applied Physics Laboratory during World War II working on the Proximity fuze.〔 In 1947 he began working for Oliver Machinery Company. In 1970 he became president of the company and chairman of the board in 1982. He retired in 1984.〔()〕 He died on October 23, 2010.〔
==Early life==
Baldwin was born in Grand Rapids, Michigan. He attended the University of Michigan, receiving his B.S. in 1934, M.S. in 1935, and Ph. D. in 1937,〔 on the "spectroscopic study of novae". After graduation he taught astronomy at the University of Michigan, University of Pennsylvania, and Northwestern University from 1935 through 1942.〔 The photographs at the Adler Planetarium, where he lectured to earn extra money, sparked his interest in lunar craters. This led to an article in ''Popular Astronomy'' in 1942 and later his book ''The Face of the Moon'', in 1949.〔()〕
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