Robert John Wagner Jr. (born February 10, 1930) is an American actor of stage, screen, and television. He is known for starring in the television shows ''It Takes a Thief'' (1968–1970), ''Switch'' (1975–1978), and ''Hart to Hart'' (1979–1984). He later had recurring roles on ''Two and a Half Men'' (2007–2008) and ''NCIS'' (2010–2019).