Glen Zipper is the producer of Oscar winning documentary “Undefeated”, as well as “Foo Fighters: Back and Forth”, and Tower Records documentary “All Things Must Pass” directed by Colin Hanks. His new film is “Betting on Zero”, a powerful docu-thriller about controversial hedge fund titan Bill Ackman, who is on a crusade, claiming that global nutritional giant Herbalife is the largest pyramid scheme in history.