[4] His additional film credits include American Hot Wax, Rabbit Test, The Buddy System, I.Q., Heaven Can Wait, Sliver and Richie Rich's Christmas Wish.

His additional Broadway credits include The Cherry Orchard, A Patriot for Me, Via Galactica, Annie, Night Watch and La Cage aux Folles.

[10] Curtis played a recurring role as John Allen Hill, the owner of Melville's Restaurant on Cheers, and as a wealthy banker on the short-lived Bea Arthur vehicle Amanda's.

His many television credits include The Magician as quirky columnist Max Pomeroy opposite Bill Bixby, Gypsy starring Bette Midler and two appearances on Three's Company.

He also provided the voice of Grand Moff Tarkin for the radio adaptation of Star Wars Episode IV: A New Hope as well as that of Lord Balthazar on The Smurfs from 1981 to 1989.