Daniel Isaac Aryeh Cohen (born 1946) is an American mathematician and computer scientist who is now a professor emeritus at Hunter College. Cohen earned a bachelor's degree in mathematics from Princeton University in 1967 and already as an undergraduate published a research paper about Sperner's lemma, which he learned about from Hans Rademacher. He completed his doctorate in 1975 from Harvard University under the joint supervision of Andrew M. Gleason and Gian-Carlo Rota. He was a mathematician at Hunter College in 1981 when the computer science department was founded, and became one of five initial computer science professors there.