Keith Ian Carradine (/ˈkærədiːn/ KARR-ə-deen; born August 8, 1949) is an American actor. In film, he is known for his roles as Tom Frank in Robert Altman's Nashville, E. J. Bellocq in Louis Malle's Pretty Baby, and Mickey in Alan Rudolph's Choose Me. On television, he is known for his roles as Wild Bill Hickok on the HBO series Deadwood, FBI agent Frank Lundy on the Showtime series Dexter, Lou Solverson in the first season of FX's Fargo, Penny's father Wyatt on the CBS sitcom The Big Bang Theory, and U.S. President Conrad Dalton on the CBS political drama Madam Secretary.