Frank Rattray Lillie

Frank Rattray Lillie (born June 27, 1870, Toronto, Ont., Can.—died Nov. 5, 1947, Chicago, Ill., U.S.) was an American zoologist and embryologist, known for his discoveries concerning the fertilization of the egg (ovum) and the role of hormones in sex determination. Lillie spent most of his career at the University of Chicago (1900–47), where he served as professor of embryology (1906–35), chairman of the zoology department (1910–31), and dean of the biological sciences division (1931–35)....