George Tyssen Butler (born 12 October 1943) is a British-American filmmaker and photographer, and a pioneer of the theatrical documentary. Some of his most popular films include Pumping Iron, which introduced moviegoers to the then anonymous Arnold Schwarzenegger,The Endurance film trilogy, retelling Sir Ernest Shackleton’s saga of Antarctic survival, and Going Upriver: The Long War of John Kerry, about his friend John Kerry’s leadership in the peace movement, Butler has also produced acclaimed IMAX® features, such as the award-winning Shackleton’s Antarctic Adventure and Roving Mars.