<Li> Played by John Sylvester White </Li> <P> Michael Woodman is the curmudgeonly vice-principal (and later principal) of Buchanan High . He makes no secret of his dislike for the Sweathogs, whom he considers the bottom of the social register at his school . He refers to non-Sweathogs as "real" students . When Kotter was a student at Buchanan, Woodman taught social studies, the same class Kotter returns to Buchanan to teach . His old age, and sometimes his diminutive height, are common jokes with the Sweathogs . Woodman was totally against Kotter's unorthodox teaching methods and at one point even put Kotter in front of the school's review board in an unsuccessful attempt to have him fired . As the series progresses, Woodman begins to tolerate them marginally . In the season one episode "No More Mr. Nice Guy", Kotter is shown to be a gifted teacher, willing to wear historic costumes, and role - play in front of the class during his lessons . </P> <Ul> <Li> Played by John Travolta </Li> </Ul> <Li> Played by John Travolta </Li>

What was john travolta's name on welcome back kotter
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