 Alexander voiced Catbert, the evil director of human resources, in the short-lived animated series "Dilbert", based on the popular comic strip.Alexander made cameo appearances as himself in the second season of "Curb Your Enthusiasm", and appeared in the seventh season of "Curb Your Enthusiasm" along with the other three principal "Seinfeld" cast members.He had a part in the ABC sitcom "Dinosaurs" as Al "Sexual" Harris (who frequently engaged in sexual harassment), as well as other voices.