Waller, at six feet tall and 230 pounds, was one of the most frequent winning amateur bodybuilders of the 1970s. His most notable win was depicted in the film Pumping Iron, at the Mr. Universe contest of 1975. In a controversial contest, he edged out Roger Walker of Australia, Paul Grant of Wales and his fellow Pumping Iron co-star, Mike Katz, of the USA, to take the first place. He went on to compete at the professional level the following year in the 1976 Mr. Olympia contest, where he again defeated Mike Katz to win first place in the heavyweight division. He continued to place in the 1977, 1980 and 1981 Mr. Olympias, taking second place in the tall category and fifth overall in 1977. Unlike Frank Zane or lighter competitors, Waller was not known for an aesthetic physique, rather, like fellow competitors, Arnold Schwarzenegger and Lou Ferrigno, he relied on size to gain the attention from judges, which at the time, was only beginning to gain popularity.
Appearance in ''Pumping Iron''
Waller was briefly featured in the photo-essay book of the same name by George Butler and Charles Gaines, but gained much more notoriety from the film documentary of 1977. In it, Waller is portrayed in a somewhat negative light as the antagonist and chief competition of Mike Katz, whose storyline was featured much more prominently in the film. Waller is shown as a devious and cunning character who tries to undermine Mike Katz's concentration by hiding his lucky T-shirt, and discussing his plan to do so with fellow bodybuilders Roger Callard and Robby Robinson in one of the film's most memorable and infamous scenes. In reality, the "T-shirt incident" was staged to add drama to the film, and the scene where Waller confides his scheme was filmed after the Mr. Universe contest actually took place. Waller can actually be seen wearing two different shirts in different camera angles in that scene, making it obvious that it was set up. Waller and Katz were, in fact, friends – as Waller recounted in Raw Iron – The Making of Pumping Iron – but his reputation as a "villain" remained. "I would go to contests and get booed, after that!" said Waller in a later interview.
Other film appearances
Waller had an uncredited, but prominent, cameo in the film Stay Hungry as "Dougie Stewart", the rival of bodybuilder Joe Santo This film was written by Charles Gaines, co-author of Pumping Iron. He also appeared in the B movieKill The Golden Goose in 1979, "Flex" and in "King of the Beach", an episode of The Incredible Hulk, in 1981.
