William Frederic Burr (born June 10, 1968) is an American stand-up comedian, actor, writer, podcaster, and social critic who has released several stand-up comedy specials.
 Outside of stand-up comedy, he is known for hosting the "Monday Morning Podcast", playing Patrick Kuby in the AMC crime drama series "Breaking Bad", and
Reginald Darnell Hunter (born 26 March 1969) is an American stand-up comedian based in the United Kingdom.
Robin McLaurin Williams (July 21, 1951 – August 11, 2014) was an American stand-up comedian and actor.
 Starting as a stand-up comedian in San Francisco and Los Angeles in the mid-1970s, he is credited with leading San Francisco's comedy renaissance.
 After rising to fame as Mork in "Mork & Mindy" (1978–82), Williams established a career in both stand-up comedy and feature film acting.
 He was known for his improvisational skills.
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.
Martin Høgsted (born in 1982, Dianalund) is a Danish stand-up comedian.
 He is known for UPS!
 Det er live, and as writer from Live fra Bremen.
 He debuted as comedian in 2006 on Comedy Zoo in Copenhagen and won DM i stand-up (Best Danish stand-up comedian) in 2008.
Joe List (born April 6, 1982) is an American stand-up comedian.
 He began performing stand-up comedy in Boston, Massachusetts in 2000, shortly after graduating from high school.
 He has been featured on Conan and The Late Show with David Letterman.
 In 2015 List was a finalist on NBC's Last Comic Standing and recorded a half-hour comedy special on Comedy Central.
 His albums 'So Far No Good' and 'Are You Mad at Me?'
 can be heard regularly on Sirius Radio.
 List is also the co-host of his own popular weekly podcast 'Tuesdays with Stories' with fellow comedian Mark Normand as well as being a regular on Robert Kelly's 'You Know What Dude' podcast.
 In 2016 he toured the United States and Europe opening for Louis CK on his international tour which included three performances at Madison Square Garden.
 List is a regular at the Comedy Cellar in New York City.
It's Only a Theory is a British television panel game show, first aired on BBC Four in 2009.
 It was conceived by and starred Andy Hamilton and featured Reginald D. Hunter as a regular panelist.
 Announced by the BBC in April 2009, the eight episode series was produced by Hat Trick Productions.
Rodney Scott Carrington (born October 19, 1968) is an American stand-up comedian, actor, and country music artist.
 He has released six major-label studio albums and a greatest-hits package, on Mercury Records and Capitol Records.
 His comedy act typically combines stand-up comedy and original songs.
 Carrington has also starred in the sitcom "Rodney" and in the 2008 film "Beer for My Horses".
Eddie Gossling is an American stand-up comedian residing in Los Angeles, California.
 He is known for his absurd humor and his voice work in Disney's motion picture "The Wild".
 He is married to fellow stand-up comedian Megan Mooney.
Stand-up comedy is a comic style in which a comedian performs in front of a live audience, usually speaking directly to them.
 The performer is commonly known as a comic, stand-up comic, stand-up comedian, or simply a stand-up.
 In stand-up comedy, the comedian usually recites a grouping of humorous stories, jokes and one-liners typically called a monologue, routine, or act.
 Some stand-up comedians use props, music, or magic tricks to "enhance" their acts.
 Stand-up comedy is often performed in comedy clubs, bars and pubs, nightclubs, neo-burlesques, colleges and theatres. Outside of live performance, stand-up is often distributed commercially via television, DVD, CD and the internet.

Question: Which American stand-up comedian starred in  It's Only a Theory
Answer: Reginald Darnell Hunter