Yale-educated and born with a silver spoon in his mouth, Sam Wagstaff’s transformation from innovative museum curator to Robert Mapplethorpe’s lover and patron is intensively probed in Black White + Gray. During the heady years of the 1970s and 1980s, the New York City art scene was abuzz with a new spirit, and Mapplethorpe would be at the center of it. Wagstaff pulled him from...