[1] Born in New York City,[2] Dell almost made his stage debut a few years before Dead End when he and his sister were slated for roles in The Good Earth with Alla Nazimova and Claude Rains.

Dell appeared in the play The Sign in Sidney Brustein's Window, written by Lorraine Hansberry.

His other non-Dead End Kids/Bowery Boys films included The 300 Year Weekend (1971), Who Is Harry Kellerman and Why Is He Saying Those Terrible Things About Me?

including Ben Casey, The Fugitive, Mannix, Then Came Bronson, I Dream of Jeannie, McCloud, Sanford and Son, and Barney Miller.

According to differing sources, either Don Francks,[3] Charles Bronson, or Dell[4] was the uncredited actor providing the voice of Boba Fett, a Mandalorian bounty hunter, in the Star Wars Holiday Special.