1912 - Born on June 5th in in Milwaukee, Wisconsin. He is the Curator of Birds for the American Museum of Natural History.
1937 - Joined the Museum after graduating from Hobart College.
1940 - Dean was appointed Assistant Curator.
1947 - He received his doctorate at Cornell University with a thesis on Hawaiian honeycreepers.
1950 - Appointed as Associate Curator.
1955 - He was appointed as Lamont Curator.
1957-1973 - He was Chairman of the Department.
2003 - Passed away at his home in Tenafly, New Jersey at age 90.
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