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John D'Aquino (born April 14, 1958) is an American film and television actor, best known for his role as Lieutenant Benjamin Krieg in seaQuest DSV, Joel in the film Pumpkinhead, U.S. President Richard Martinez in the Disney Channel Original Series Cory in the House, and for his appearance as Ulysses in Xena. He is also known for his roles as Frank LaMotta in Quantum Leap, Todd Gack in "The Calzone" episode of Seinfeld, and playing Sally's teacher boyfriend, Mr. Wikipedia