Yiannis Nicholas Moschovakis is a set theorist, descriptive set theorist, and recursion theorist, at UCLA. For many years he has split his time between UCLA and University of Athens . His book Descriptive Set Theory is the primary reference for the subject. He is especially associated with the development of the effective, or lightface, version of descriptive set theory.
Moschovakis earned his Ph.D. from University of Wisconsinâ€“Madison in 1963 under the direction of Stephen Kleene, with a dissertation entitled Recursive Analysis.