William John Hartack Jr. (December 9, 1932 – November 26, 2007) was a Hall of Fame jockey. He was born in Ebensburg, Pennsylvania.Referred to by the media as both "Bill" and "Willie" (actually Hartack detested being called "Willie" because of his dislike for fellow jockey Willie Shoemaker) during his racing career, Hartack grew up on his widowed father's farm in the Blacklick Township area of Cambria County, Pennsylvania. Small in stature, at age 17 he stood 5 ft. 4 in.