Tien-Yien Li

Li, Tien-Yien
Born	李天岩 1945
Nationality	United States
Fields	Mathematics
Institutions	Michigan State University
Alma mater	National Tsing Hua University (1968) University of Maryland, College Park Ph.D (1974)
Doctoral advisor	James Yorke
Notable awards	Guggenheim Fellowship (1995)

Tien-Yien Li (李天岩) (born 1945) is a University Distinguished Professor of Mathematics at Michigan State University and a Guggenheim Fellow. Li and co-author James Yorke published a paper in 1975 entitled Period three implies chaos, in which the mathematical term chaos was coined.