Question: who plays tony dinozzo's father on ncis
Answer: Robert John Wagner , Jr. ( pronounced / ˈwæɡnər / ; born February 10 , 1930 ) is an American actor of stage , screen , and television , best known for starring in the television shows It Takes a Thief ( 1968 -- 70 ) , Switch ( 1975 -- 78 ) , and Hart to Hart ( 1979 -- 84 ) .