O'Horgan directed and composed the score for the screen adaptation of Futz with Frederic Forrest, Sally Kirkland, and Jennifer O'Neill, and directed the film version of Eugène Ionesco's Rhinoceros starring Zero Mostel, Gene Wilder, and Karen Black (and which featured a score by Hair composer Galt MacDermot).
O'Horgan was responsible for directing and composing music for Futz with Frederic Forrest, Sally Kirkland, and Jennifer O'Neill. He also directed the film adaptation of Eugène Ionesco's Rhinoceros, which starred Zero Mostel, Gene Wilder, and Karen Black, alongside a score by Galt MacDermot.