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.
Bob Newhart George Robert Newhart (born September 5, 1929) is an American stand-up comedian and actor, noted for his deadpan and slightly stammering delivery. Newhart came to prominence in the 1960s when his album of comedic monologues, "The Button-Down Mind of Bob Newhart", became a worldwide bestseller and reached number one on the "Billboard" pop album chart—it remains the 20th-best selling comedy album in history. The follow-up album, "The Button-Down Mind Strikes Back!", was also a massive success, and the two albums held the "Billboard" number one and number two spots simultaneously.