Mark Irwin Forstater is an American film and TV producer, author, audio producer, music producer and tech entrepreneur, notable for producing the classic comedy film Monty Python and the Holy Grail and then in 2012 suing the five living members of Monty Python over a dispute regarding royalties from merchandising income, including the Spamalot musical, which was "lovingly ripped off from" the Holy Grail movie. Wikipedia