eorge Segal, one of America’s most important postwar sculptors, is best known for the anonymous white cast-plaster figures he often placed in real environments. Gaining recognition in the Pop Art era of the 1960s, he frequently tied his subjects to popular culture and contemporary events. This exceptional late drawing, however, reveals another, more personal side of the artist’s talents and is part of a series of larger-than-life, black-and-white heads of family and friends that he began in the 1990s…