Sheen T. Kassouf (11 August 1928 - 10 August 2005) was an American economist from New York known for research in financial mathematics. In 1957 he married Gloria Daher in Brooklyn, New York. Kassouf received a PhD in economics from Columbia University (1965) and was later professor of economics at University of California Irvine. Together with Edward O. Thorp he co-authored the book Beat the Market in 1967.