Robert Charles Sproul, (born 1939 in Pittsburgh, Pennsylvania) is an American Calvinist theologian an pastor. He is the founder and chairman of Ligonier Ministries (named after the Ligonier Valley just outside of Pittsburgh, where the ministry started as a study center for college and seminary students) and can be heard daily on the Renewing Your Mind radio broadcast in the United States and throughout 60 countries. Ligonier hosts several theological conferences each year, including the main conference held each year in Orlando, Florida, at which Sproul is one of the primary speakers.