Ed Begley Jr. is an American actor and environmentalist, best known as Dr. Victor Ehrlich on NBC's St. Elsewhere. Other television credits include Stan Sitwell on FOX’s Arrested Development, Dr. Walter Krandall on CBS’ Gary Unmarried, Cyrus O'Dell on CBS’ Veronica Mars, Hiram Gunderson on HBO’s Six Feet Under, and Dr. Hank Hastings on WB’s 7th Heaven.

Film credits include Imperfections, Time Toys, The Summerland Project, Muhammad Ali's Greatest Fight, Making Change, Pineapple Express, Pittsburg, In Pursuit of Happiness, Dark Horse, Waiting to Act, This is Spinal Tap, Blue Collar, and Cockfighter.

Theatre credits include Charles Smith in November (Mark Taper Forum), Mayor Shinn in The Music Man (Benedum Center), and Del in The Cryptogram and Carl in The Old Neighborhood (Geffen Playhouse). He also directed and starred in his own play, Cesar and Ruben, winning a Nos Otros Award and four Valley Theatre League Awards (El Portal Theatre).