Joshua Loth Liebman (1907–1948) was an American Reform rabbi and best-selling author, best known for the book Peace of Mind, which spent more than a year at #1 on the New York Times Best Seller list. Born in Hamilton, Ohio, Liebman graduated from the University of Cincinnati when he was 19 years old. He went on to be ordained and also earned a doctorate in Hebrew letters from Hebrew Union College. From 1934 to 1939, Liebman served as rabbi of K.A.M. Temple in Chicago, Illinois. In 1939, Liebman became the rabbi of Temple Israel, a Reform synagogue in Boston, Massachusetts.