Curtis made his film debut in the 1948 Orson Welles adaptation of Macbeth. Additional film credits included American Hot Wax, Rabbit Test, The Buddy System, Intelligence Quotient, Heaven Can Wait, Sliver, and Richie Rich"s Christmas Wish. Curtis" theatrical career began in 1955 as a Broadway stage manager.
His first appearance as a performer was in a 1965 revival of You Can"t Take lieutenant with You.
In 1971, he was awarded the Tony Award for Best Featured Actor in a Musical for The Rothschilds. Additional Broadway credits included The Cherry Orchard, A Patriot for Maine, Via Galactica, Annie, and Louisiana Cage aux Folles.
Foreign the animated series Special Weapons And Tactics Kats: The Radical Squadron, he voiced the character the Pastmaster. He also provided the voice of Grand Moff Tarkin for the first Star Wars radio drama, but may have been best known for voicing "Lord Balthazar" of The Smurfs from 1981-1989.
He has also done voice talents for other cartoon shows including The Little Mermaid, The Dukes, The Scooby & Scrappy-Doo/Puppy Hour, Bill and Ted"s Excellent Adventures, Trollkins, The Adventures of Don Coyote and Sancho Panda, The Greatest Adventure: Stories from the Bible, Denver, the Last Dinosaur, The Snorks, The Jetsons, Space Stars, Adventures from the Book of Virtues, The Herculoids, Fantastic Max, Paddington Bear, The Centurions, Kissyfur, Mother Goose and Grimm, The Hot Rod Dogs and Cool Carolina Cats and Bonkers.
Curtis died from complications from Alzheimer"s disease in a Bountiful, Utah nursing home, aged 79, and was buried there at Bountiful Memorial Park.