Kevin O'Sullivan's first major role was in the TV show "Beverly Hills, 90210" alongside a cast that included Lisa Ann Cabasa, Jason Priestley, Ian Ziering, Jennie Garth and Brian Austin Green. Kevin was a guest star on "Days of Our Lives" on NBC. He was also awarded Best Supporting Actor at the 2024 Egyptian American Film Festival in New York City for his portrayal of Officer John Nelson in the Oscar-qualified film "The Deal."

His latest role is in the film "Choleric" scheduled to be released in 2026.