Philip Gefter, a photography critic, is the author Wagstaff: Before and After Mapplethorpe, for which he received the 2014 Marfield Prize, the national award for arts writing. His collection of essays, Photography After Frank, was published by Aperture in 2009. He was on staff at The New York Times for over fifteen years, where he wrote regularly about photography. He produced the 2011 documentary, "Bill Cunningham New York." His biography of Richard Avedon is due out in October from Harper.