I have loved and admired Robin Williams' work ever since I first watched him as the lovable hyperactive alien Mork from TV's Mork and Mindy (photo courtesy of Darsie, Wikimedia Commons). It seemed that even scripted material became improvisation when in the hands of The Master Improv Artist Extraordinaire!
The tantalizing theory that William Shakespeare is not the author of the works credited to him has been argued since the 19th century. "The Shakespeare authorship question is the argument that someone other than William Shakespeare of Stratford-upon-Avon wrote the works attributed to him. Anti-Stratfordians—a collective term for adherents of the various alternative-authorship theories—say that Shakespeare of Stratford was a front to shield the identity of the real author or authors, who for some reason did not want or could not accept public credit." -- Wikipedia.com