Trager earned a BA in psychology from City College of New York in 1969.
He was teaching at Dutchess Community College, Poughkeepsie, New York (since 1978), and at State University of New York, New Paltz (since 1979). In 1980 he was also associate curator of the Catskill Center for Photography in Woodstock, New York. Previously, Trager taught at La Guardia Community College, Long Island City, New York (1976-78).
Working with a view camera, Träger photographs people. “I am interested," he says, "in the presentation of self before the camera - the relationship between camera, subject, and photographer."