Andy Richter ( born October 28 , 1966 ) is an American comedian and actor , best known for his former role as Conan O'Brien 's sidekick on Late Night with Conan O'Brien . Paul Andrew `` Andy '' Richter ( born October 28 , 1966 ) is an American actor , writer , comedian , and late night talk show announcer . He is best known for his role as the sidekick of Conan O'Brien on each of the host 's programs : Late Night and The Tonight Show on NBC , and Conan on TBS .