Jason Alexander (born September 23, 1959) is an American actor, comedian and singer. He is best known for his role as George Costanza on the television series Seinfeld, appearing in the sitcom from 1989 to 1998. He also has had an active career on the stage, appearing in several Broadway musicals including Jerome Robbins' Broadway in 1989, for which he won the Tony Award as Best Actor in a Musical. He appeared in the Los Angeles production of The Producers.
Jason Alexander provides assorted voices for American Dad!, including Mr. Orlando in "Cow I Met Your Moo-ther", as well as appearing as a celebrity robot in "Tearjerker".