<Tr> <Th> Years active </Th> <Td> 1987--present </Td> </Tr> <Tr> <Th> Website </Th> <Td> michaelmcdonald.biz </Td> </Tr> <P> Michael James McDonald (born December 31, 1964) is an American actor, director, writer, and comedian . He is best known for starring in the sketch comedy show MADtv . McDonald joined the show during the fourth season (1998) and remained in the cast until the end of the thirteenth and penultimate season, having become the longest - tenured cast member . While on the show, he developed many memorable characters . He was a contributing writer and director on MADtv . </P> <P> McDonald also directed several episodes of the comedy - drama series Scrubs, on which he guest - starred 6 times . </P>

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