Hartack, (William John Jr.) Bill(1932– ) jockey; born in Ebensburg, Pa. Between 1956 and 1969, he won the Kentucky Derby five times, the Preakness three times, and the Belmont once. He served as an occasional television commentator after 1981.
The Cambridge Dictionary of American Biography, by John S. Bowman. Copyright © Cambridge University Press 1995. Reproduced with permission.