who plays zach in the big bang theory
Brian Thomas Smith Brian Thomas Smith (born May 13, 1977) is an American actor and comedian known for playing the dim-witted but kind-hearted Zack Johnson on The Big Bang Theory, and his appearances on Fear Factor and The Amazing Race Season 7. He has also made guest appearances on Two and a Half Men and The 100 Greatest TV Quotes & Catchphrases.
Jim Parsons James Joseph Parsons (born March 24, 1973) is an American actor. He is known for playing Sheldon Cooper in the CBS sitcom The Big Bang Theory.[3][4][5] He has received several awards for his performance, including four Primetime Emmy Awards for Outstanding Lead Actor in a Comedy Series[6] and the Golden Globe Award for Best Actor in a Television Series Musical or Comedy.