Stephen Morris is an economic theorist recognized for his work on the foundations and applications of game theory. He is known particularly for his work on higher-order beliefs in economics and game theory. He was born in Weybridge, England, and graduated from the University of Cambridge with a degree in Mathematics and Economics in 1985. He received a Ph.D. in Economics from Yale University in 1991, after working as an economist for two years for the Government of Uganda. He taught at the University of Pennsylvania, Yale University and Princeton University before joining the Massachusetts Institute of Technology in 2019, where he is currently the Peter A. Diamond Professor of Economics. He served as President of the Econometric Society in 2019 and is an elected member of the American Academy of Arts and Sciences and the National Academy of Science.