Stephen Krashen

Stephen Krashen
Born (1941-05-14) May 14, 1941
Chicago, Illinois, U.S.
CitizenshipUnited States of America
Academic background
Alma materUniversity of California, Los Angeles
Academic work
DisciplineLinguist
InstitutionsUniversity of Southern California
Main interestsSecond-language acquisition
Websitewww.sdkrashen.com

Stephen D. Krashen (born May 14, 1941) is an American linguist, educational researcher and activist known for developing the input hypothesis, a group of five hypotheses of second-language acquisition. He is Emeritus Professor of Education at the University of Southern California. He moved from the linguistics department to the faculty of the School of Education in 1994.