Cal Lepore

Leonard Charles "Cal" Lepore (April 15, 1919 – December 7, 2002) was an American football head linesman, line judge and referee. as an officiating tool, as well as urging the use of coaches' challenges in professional football. The NFL adopted nearly all of the components of the Replay Rule he authored and first administered in mid-1980s in the USFL. Referee Magazine has considered him one of the most influential officials in the history of sports. Lepore was also the referee of the "Miracle at the Meadowlands" on November 19, 1978.

Lepore was born in Chicago and attended Harper High School there. He then played professional baseball; his 1940 draft registration card listed his employer as the Chicago White Sox, Lepore served in the United States Army during World War II.