Upon graduating in 1928, he wrote for the ''
New York Herald Tribune's Sunday book supplement thanks to a recommendation by Thornton Wilder. By 1929, he secured a position at The New Yorker magazine as a reporter for the "Talk of the Town" section. Though he contributed to numerous publications in his career, he would be affiliated and most firmly identified with The New Yorker''. While with
The New Yorker, Hellman wrote extensively about New York institutions such as the
New York Zoological Society and the
Bronx Zoo, the
Metropolitan Museum of Art, the
Metropolitan Opera House, the
Museum of Modern Art, the
New York Public Library, the
Pierpont Morgan Library, the
United Nations, and the
New York Stock Exchange, to promote public awareness of these institutions and of interesting events they sponsored. He also wrote about prominent people such as author
Louis Auchincloss; New York Parks Commissioner
Robert Moses, who sent him story ideas; and architect
Frank Lloyd Wright. Because of his background and family connections, he was also
The New Yorker's link to Manhattan society, reporting on parties, local clubs and societies such as the
Grolier Club,
The Explorers Club, the
National Audubon Society, and the
American Geographical Society, and exclusive restaurants, from which he collected an impressive number of menus. His books include compilations of his pieces that appeared in
The New Yorker ('Mother Taft's Chickens,' 'How to Disappear for an Hour' and 'Mrs. De Peyster's Parties') and a book about the
Smithsonian Institution ('Octopus on the Mall') and a history of the
American Museum of Natural History ('Bankers, Bones and Beetles'). As recently as June 2013 his research for a 1940 profile on
Robert Ripley was cited for its exhaustive scope in a review of the latest Ripley biography. From 1936 to 1938, he was also the associate editor of
Life magazine. During World War II, Hellman was in Washington D.C. where he wrote for the
Office of the Coordinator of Inter-American Affairs, the
War Department and helped to write a top-secret history of the
OSS. In addition to his pursuits as a writer, Hellman was an enthusiastic butterfly collector. ==Marriage and family life==