Don Amendolia
Don Amendolia is an American actor most notably recognized from his recurring role as Big Al Kennedy in NBCs soap opera Sunset Beach, recurring role on Twin Peaks and many other guest roles. He also directed one episode of Growing Pains and two episodes of Harry and the Hendersons. He has appeared on Broadway inVariations, Stepping Out, and My One and Only. He directed the rotating cast of the OffBroadway show, Wicked. He is currently playing the Wizard on the Second national tour of the musical Wicked. He played his first performance on December 9, 2009, replacing Tom McGowan. He is also credited with giving acting lessons to the entire cast of the film Purple Rain.
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Source: Wikipedia