Writer and photography critic Philip Gefter is the author of a new biography of Sam Wagstaff, the influential collector and curator. Wagstaff: Before and After Mapplethorpe, is being published by W.W. Norton on November 3. Gefter’s article in the New York Times last week, The Man Who Loved Photographs, gave a glimpse of the book, which highlights the importance of Wagstaff in the creation of a burgeoning photography market and the extraordinary level of connoisseurship he brought to the field. Wagstaff met Robert Mapplethorpe in 1972, and he tends to be best known today as Mapplethorpe’s mentor and lover. Gefter’s new book explores the importance of that relationship but also Wagstaff’s larger influence on the art world.