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Although African-American comedians had long been a staple of the stand-up circuit prior to the emergence of Bill Cosby, none had come even remotely close to reaching the same heights of commercial success or universal acceptance. Before Cosby, black comics were largely relegated to the so-called "chitlin circuit" of black nightclubs and theaters, their albums banned from white-owned record stores; after Cosby, comedians of all racial and cultural backgrounds found a home in the mainstream, and were even given the opportunity to prove their talents in major film and television roles. Simply put, Cosby broke comedy's color barrier, and he set the stage for the widespread success of everyone from Richard Pryor to Eddie Murphy.

William H. Cosby, Jr. was born in Philadelphia on July 12, 1937. The son of a maid and an absentee father, he grew up in abject poverty, ultimately dropping out of high school to join the Navy. After earning his diploma through correspondence courses, he won a football scholarship to Temple University; while taking classes during the day, he tended bar in the evenings, where his easy ability to make customers laugh resulted in the decision to pursue a career in comedy.