Clinton O. Casey Sander (born July 6, 1956) is an American actor known as the character Captain Jimmy Wennick on the short-lived TV series Tucker. His television credits also include Criminal Minds, The Golden Girls,Grace Under Fire, Home Improvement, Malcolm in the Middle, Rules of Engagement, Sons of Anarchy, Mad Men, Silicon Valley, The Newsroom, Buffy the Vampire Slayer (on which he portrayed the father of Xander Harris), Hunter, and Marvin Marvin, among other shows. He has a recurring role on the TV sitcom The Big Bang Theory as Bernadettes father, Mike.
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