Comic Jackie is a popular American stand-up comedian, actress, and writer. She is best known for her role as Mason on the hit television show 'The Big Bang Theory'. Mason is a character who is a physicist at Caltech and is often seen as the voice of reason among the group of friends. Jackie has also appeared in films such as 'Trainwreck' and 'The House'. She has won numerous awards for her work in comedy and acting, including an Emmy Award for Outstanding Lead Actress in a Comedy Series.