Frederick Antony Ravi Kumar Zacharias (March 26, 1946 – May 19, 2020) was an Indian-born Canadian-American Evangelical Christian apologist and evangelist. Zacharias was the author of many Christian books, such as the Gold Medallion Book Award winner "Can Man Live Without God?" Zacharias established Ravi Zacharias International Ministries (RZIM) and presented the radio programs "Let My People Think" and "Just Thinking".