who plays leroy jethro gibbs father on ncis
Ralph Waite Ralph Waite (June 22, 1928 â€“ February 13, 2014) was an American actor and political activist, best known for his role as John Walton, Sr. on The Waltons (1972-1981), which he occasionally directed. He also had a recurring role in NCIS as Jackson Gibbs, the father of Leroy Jethro Gibbs. Waite had supporting roles in movies like Five Easy Pieces (1970), The Grissom Gang (1971), The Bodyguard (1992), and Cliffhanger (1993).[1]