Wirth continued acting, working in both film and television, appearing for Example in Abel Ferrara's 1993 film Body Snatchers as well as Sex and the City and CSI. He took part in the television series American Gladiators, competing during the series' first season in 1989 and advancing to the first-half semifinals before falling. He also starred in Charmed as Matthew Tate. Since 1999, he has been writing, directing, and producing independent films. His work on directing, writing, and producing his 2001 film MacArthur Park has earned him several award nominations. In addition to his work in the film industry, Wirth is a musician and Artist.