Morton Smith (May 29, 1915 – July 11, 1991) was an American professor of ancient history at Columbia University. He is best known for his reported discovery of the Mar Saba letter, a letter attributed to Clement of Alexandria containing excerpts from a Secret Gospel of Mark, during a visit to the monastery at Mar Saba in 1958. This letter fragment has had many names, from The Secret Gospel through The Mar Saba Fragment and the Theodoros.