Percy Seitlin was a writer and co-editor of PM and AD magazines. He served on the staff of the Composing Room from 1933 to 1943 and helped to organize and run the AD Gallery and then Gallery 303. He was director of advertising and publicity at Aetna Steel Products Corp., head of product publicity for Celanese Corporation of America, did PR for the Museum of Modern Art's exhibit on Marcel Breuer, wrote poetry, short stories, advertising copy and articles on the graphic arts and typography for several publications. His books include New York: People and Places.