Joan Rivers was more than a legendary comedian; she was an icon and a role model to millions, a fearless pioneer who left a legacy of expanded opportunity when she died in 2014. Her life was a dramatic roller-coaster of triumphant highs and devastating lows: the suicide of her husband, her feud with Johnny Carson, her estrangement from her daughter, her many plastic surgeries, her ferocious ambition and her massive insecurities. But Rivers' career...