By Jon Lisi, Hollywood Staff
Joan Rivers is one of the most enduring comics in show business. She began her career as a guest on The Tonight Show with Johnny Carson in 1965 and recently returned to The Tonight Show with Jimmy Fallon after a 26-year ban. This is a moment of vindication for Rivers and her loyal fans, as she experienced many professional and personal highs and lows in between. The fact that Rivers is still in show business is amazing, but it is not unfathomable. Rivers is a hard worker, and below are significant lessons that we can learn from her sustained success throughout the years.