Robert John Wagner is an American film and television actor, known primarily for his recurring role as Sean Henry Simpson in movies, soap operas and television. In his early days in Hollywood in the 1950s, he was mentored by the movie actor Spencer Tracy.

He also starred in three popular American television series that spanned three decades: as playboy-thief-turned-secret-agent, Alexander Mundy, in It Takes a Thief (1968 - 1970), as Eddie Albert's ex-con man turned crime-fighting partner, Det. Pete T. Ryan, in the con-artist-oriented drama Switch (1975 - 978), and as Stefanie Powers's super-rich husband and private-eye partner, Jonathan Hart, in the lighthearted crime drama Hart to Hart (1979 - 1984). He also starred as Number Two in the Austin Powers films of the late 1990s and early 2000s. He is currently starring as Teddy on the TV sitcom "Two and a Half Men".

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