Before joining "The Big Bang Theory," Helberg builds his career through television, film, and sketch comedy. He appears in series such as "MADtv," where he performs a variety of characters, gaining experience in comedic timing and ensemble work prior to his role on the sitcom.

Helberg also appears in feature films, including roles in comedies such as "Good Night, and Good Luck." and other projects across different genres, working with a range of directors and casts. These roles provide him with experience in both comedic and dramatic settings before joining the series.

In addition to his on-screen work, Helberg participates in theater and musical performances, drawing on his background in music and piano. His training and experience in live performance contribute to his versatility as an actor across different mediums.

Outside of acting, Helberg continues to pursue work in television and film while engaging in music and creative projects connected to performance and storytelling.