Which actor portrayed Caltech president Siebert?

Joshua Malina portrayed Caltech president Siebert in The Big Bang Theory.

Malina’s Siebert is the president of the California Institute of Technology, the Pasadena institution where Leonard, Sheldon, Howard, and Raj work. He is a recurring authority figure who deals with the scientists’ professional disputes, research projects, and occasional crises.

Malina was already familiar to television audiences before joining the sitcom. He played Will Bailey on The West Wing and Jeremy Goodwin on Sports Night, both created by Aaron Sorkin. He later appeared as David Rosen on Scandal.

A common mix-up is confusing Siebert with other Caltech figures, including Raj’s father, Dr. V. M. Koothrappali, or with actors who played professors and administrators on the show. The listed alternatives are associated with other roles or productions, but Malina is the canonical actor credited as President Siebert.