Twenty-First Century Entertainment

This sound editing company, Twenty-First Century Entertainment (formerly known as 21st Century Sound Design Corp.) was founded by Joel Valentine, who developed "The Producer's Sound Effects Library", and has worked on the following shows, movies and TV specials, mainly ones from Hanna-Barbera and Cartoon Network. They usually credit sound editing only.

• 2 Stupid Dogs/Super Secret Secret Squirrel (2 Stupid Dogs segments only)
• The Halloween Tree (1993)
• The Town Santa Forgot (1993)
• What a Cartoon (many episodes) - Audio Services, Sound Editing
• Jonny Quest Versus the Cyber Insects (1995) - Sound Effects Editorial
• Dexter's Laboratory (first two seasons only)
• Johnny Bravo (first 3 episodes only, rooted from What A Cartoon!) - Audio Services
• The Powerpuff Girls
• Samurai Jack (Seasons 1-4; Joel does work on Season 5 though)
• Codename Kids Next Door: No P in the O.O.L. (2001)
• My Freaky Family: Welcome to My World (2001)
• The Powerpuff Girls Movie (2002) - Sound Editorial and Design
• Dexter's Laboratory: Chicken Scratch (2002) - Sound Effects Editorial
• Foster's Home for Imaginary Friends
• Welcome to Wackamo (uncredited; Joel was a sound editor on this project)
• The Powerpuff Girls Rule! (2008)
• Korgoth of Barbaria
• Sym-Bionic Titan