Which of these professions is not exercised by Trey Parker?

Randolph Severn "Trey" Parker III (born October 19, 1969) is an American actor, animator, writer, producer, director, and composer. He is known for co-creating "South Park" (1997–present) and co-developing "The Book of Mormon" (2011) with his creative partner Matt Stone. 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. The two collaborated on various short films, and starred in the feature-length musical "Cannibal! The Musical" (1993).

Parker and Stone moved to Los Angeles and wrote their second film, "Orgazmo" (1997). Before the premiere of the film, "South Park" premiered on Comedy Central in August 1997. The duo possess full creative control of the show, and have produced music and video games based on it. A film based on the series, "South Park: Bigger, Longer & Uncut" (1999), received good reviews from both critics and fans.

Parker was born in Conifer, Colorado, the son of insurance saleswoman Sharon and geologist Randolph "Randy" Parker. He was a shy child who received "decent" grades and was involved in honors classes. He idolized "Monty Python", which he began watching on television in the third grade; his later ventures into animation would bear considerable influence from Terry Gilliam.