Rosen graduated from Columbia University in 1984 and obtained his Ph.D. at Princeton in 1992, under the supervision of Paul Benacerraf.
[1][2] He taught at the University of Michigan, Ann Arbor for several years before joining the Princeton faculty in 1993.
He has served as chair of Princeton's Council of the Humanities and director of the Behrman Undergraduate Society of Fellows.
[3] In 1990 Rosen introduced modal fictionalism, a popular position on the ontological status of possible worlds.
He is the co-author of A Subject with No Object (Oxford University Press, 1997), a contribution to the philosophy of mathematics written with Princeton colleague John P. Burgess.