From Wikipedia, the free encyclopedia. Jack McBrayer (born May 27, 1973 height 5' 10½" (1,79 m)) is an American actor and comedian. He gained national exposure for his characters on "Late Night with Conan O'Brien". He is best known for portraying Kenneth Parcell on the television series 30 Rock, a role for which he received an Emmy nomination in 2009. Description above from the Wikipedia article Jack McBrayer, licensed under CC-BY-SA, full list of contributors on Wikipedia.