The two collaborated on various short films and starred in the feature-length musical Cannibal! The Musical (1993). Parker was interested in film and music as a child and at high school and attended the University of Colorado, Boulder, where he met Stone. He is known for co-creating South Park (1997–present) and co-developing The Book of Mormon (2011) with his creative partner Matt Stone. Randolph Severn ' Trey' Parker III (born October 19, 1969) is an American actor, animator, writer, producer, director, and composer.