Hiram Collins Haydn (November 3, 1907 – December 2, 1973)[1] was an American writer and editor.
He was editor in chief at Random House before leaving to help establish Atheneum Publishing.
In 1959 he became one of the founders of Atheneum together with Simon Bessie and Alfred Knopf Jr.[1] He left in 1964 to join Harcourt, Brace & World.
[6][7] He wrote five novels, as well as an academic work about the "counter revolution" that he argued took place during the middle period of the Renaissance.
[1] Haydn had a seasonal home in Chilmark, Massachusetts, on Martha's Vineyard, where he died of a heart attack in December 1973 at age 66.