Walter Rauschenbusch (1861–1918) was an American theologian and Baptist pastor who taught at the Rochester Theological Seminary. Rauschenbusch was a key figure in the Social Gospel and single tax movements that flourished in the United States during the late 19th and early 20th centuries. He was also the maternal grandfather of the influential philosopher Richard Rorty and the great-grandfather of Paul Raushenbush. Source: Wikipedia (en)