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Obi-Wan "Ben" Kenobi () is a character in the Star Wars franchise. In the original film trilogy, he is a Jedi Master who trains Luke Skywalker in the ways of the Force. In the prequel trilogy, he mentors Luke's father, Anakin Skywalker. Obi-Wan is portrayed by Alec Guinness in the original trilogy and by Ewan McGregor in the prequel films. McGregor also plays the character in the television series Obi-Wan Kenobi. Guinness' performance in Star Wars (1977) earned him the Saturn Award for Best Supporting Actor, as well as a nomination for the Academy Award for Best Supporting Actor.
Source : Wikipedia