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Dean earned his tenure at Columbia by 1904, the same year he was hired by the Metropolitan as guest curator. He rapidly rose to honorary curator, and then to department head as the Arms & Armor department was formally established in [[1912]]. Dean made a number of trips to Japan, Russia, Alaska, and elsewhere, founding the Department of Reptiles and Fishes at the American Museum of Natural History even as he continued to work at both the Metropolitan and Columbia. His last trip to Japan was in 1917, during which time he met with numerous dealers and collectors, and added considerably to the Metropolitan's collection.

Dean earned his tenure at Columbia by 1904, the same year he was hired by the Metropolitan as guest curator. He rapidly rose to honorary curator, and then to department head as the Arms & Armor department was formally established in [[1912]]. Dean made a number of trips to Japan, Russia, Alaska, and elsewhere, founding the Department of Reptiles and Fishes at the American Museum of Natural History even as he continued to work at both the Metropolitan and Columbia. His last trip to Japan was in 1917, during which time he met with numerous dealers and collectors, and added considerably to the Metropolitan's collection.

A number of his notebooks from the time survive, and are valuable records of both his travels & studies, and of the formation of the department. He also published roughly 175 papers and books over the course of his career, including groundbreaking work on arms & armor, zoology, and paleontology, among other subjects. His 1905 ''Catalogue of European Arms and Armor'' was the first book on the subject by an American.

A number of his notebooks from the time survive, and are valuable records of both his travels & studies, and of the formation of the department. He also published roughly 175 papers and books over the course of his career, including groundbreaking work on arms & armor, zoology, and paleontology, among other subjects. His 1905 ''Catalogue of European Arms and Armor'' was the first book on the subject by an American, and his ''Bibliography of Fishes'', published in three volumes in 1916-1923, won the prestigious Daniel Giraud Elliot Medal, awarded by the National Academy of Sciences, in 1921.

He retired in 1927, and died the following year.

Dean retired in 1927, and died the following year.

==References==

==References==