Which American stand-up comedian starred in  It's Only a Theory
Reginald D. Hunter Reginald Darnell Hunter (born 26 March 1969) is an American stand-up comedian based in the United Kingdom.
David Cross David Cross (born April 4, 1964) is an American stand-up comedian, actor, director and writer, known primarily for his stand-up performances, the HBO sketch comedy series "Mr. Show", and his role as Tobias Fünke in the sitcom "Arrested Development". Cross created, wrote, executive produced, and starred in "The Increasingly Poor Decisions of Todd Margaret", developed and had a prominent role in "Freak Show", appeared on "Modern Family", portrayed Ian Hawke in the "Alvin and the Chipmunks" film franchise, and voiced Crane in the "Kung Fu Panda" film franchise.