I think I have between twenty and thirty commercials playing at present.

He played numerous characters on different TV series including The Wild Wild West The Rockford Files Columbo Ellery Queen Kojak Petrocelli Charlie's Angels and Hawaii Five-O. David attended Harvard University in the 1940s but did not graduate concentrating instead upon a career on the stage. Intended to be the pilot for a series the film was Thayer Davidlved by ABC.

He also appeared as Count Arne Saknussemm in the film Journey to the Center of the Earth in 1959. His raspy distinctive voice narrated many voice-overs in commercials and narrations of instructional films and commercials.