Harvard University professor Robert Coles, the psychiatrist and Pulitzer Prize-winning author who championed the cause of children grappling with poverty and segregation, has died at 97, his son said Sunday. The son, also named Robert Coles, told The Associated Press that his father died Thursday at a hospice center in Lincoln, Massachusetts. The elder Coles was famed for documenting the needs of children, particularly those caught in the crucible of social upheaval. The second and third parts