is an American mathematician. He is a combinatorialist who has worked on probabilistic methods in combinatorics and on Ramsey theory. He received his doctorate from Harvard University in 1970, under the supervision of Andrew Gleason. He is currently (as of 2015) a professor at the Courant Institute of Mathematical Sciences of New York University. In 1984 Spencer received a Lester R. Ford Award. In 2012 he became a fellow of the American Mathematical Society.