During several decades of photography, Peter has practiced both fine art and documentary projects. His current primary effort is documentation of art students in California prisons.

He has exhibited at Alcatraz Island (San Francisco), Photoville (Los Angeles) and Encuentros Abiertos de Fotografia (Buenos Aires); and published in The New York Times, The Economist, Newsweek Online, Conde Nast Traveller Magazine, Geo Saisson (Germany), Foto Mundo (Argentina), Pozytyw (Poland), and The Sunday Review (The Independent, UK).

Peter has self-published a number of books, including Paths of Discovery: Art Practice and Its Impact in California Prisons (with Dr. Larry Brewster) and Unbound! The Passion of Incarcerated Artists.