<P> 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 . </P>
<P> 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 . </P>
who plays zach in the big bang theory
who plays zach in the big bang theory
Brian Thomas Smith
Brian Thomas Smith