Original: He is best known for his role as the sidekick of talk show host Conan O'Brien on NBC 's Late Night between 1993 and 2000 , and later The Tonight Show from 2009 to 2010 , as well as on O'Brien 's upcoming talk show , Conan on TBS .
Simplified: Richter left his post at Late Night in 2000 , saying he wanted to focus on an acting career .