- In 2023, his memoirs, titled Rock in a Landslide and Eve and Me, recount his life with his late wife, Mary Ann Unger, and their daughter, Eve.
- Has been taking photographs since he was a senior in high school.
Geoffrey Biddle started taking photographs in 1967. He has been a location photographer, working for a wide variety of editorial and corporate clients, and he has taught photography extensively, including at Parsons School of Design, where he served as assistant chair of the photography department from 1994 to 2000.
He collaborated with his wife, Jane Gottesman, on Game Face: What Does A Female Athlete Look Like? and Showing (work x family). His books include Alphabet City (University of California Press, 1992), Sydney and Flora (Turtle Point Press, 2009), and God Bless America (2007), for which he also collaborated with Gottesman. His work is in multiple collections, including the Museum of Modern Art. The Alphabet City photographs and papers were acquired by The New York Public Library in 2017.
In 2023, Working Assumptions published Rock in a Landslide and Eve and Me, which recount his life with his late wife, Mary Ann Unger, in his roles as partner, parent and caregiver.