Bonnie Greer, born in 1948 to sharecroppers in Chicago and shaped by the civil rights era, spent the final four decades of her life transforming a transatlantic journey into a vocation — playwright, critic, and public conscience in her adopted Britain. She died Wednesday at 77 after a brief illness, leaving behind a body of work that refused to separate art from justice. Her passage from the American Midwest to the stages and studios of London is a reminder that belonging is sometimes chosen, and that chosen belonging can run very deep.