Simon Helberg, born December 9, 1980 in Los Angeles, California, USA, is an actor. He guest stars as Alex Dwyer in the NBC series Studio 60 on the Sunset Strip. He initially appeared as a co-star until when he was promoted to guest star. He is also known for his starring role in the sitcom The Big Bang Theory. He appeared in the films Van Wilder: Party Liaison, Good Night, and Good Luck, and A Serious Man. He has appeared on the sketch comedy series MADtv and is also known for his role as Moist in the Joss Whedon-led web miniseries Dr. Horrible's Sing-Along Blog.