watch 01:21 The Loop (TV) Do you like this video? David Schwartz is an American writer, producer, and director, who has written for Hanna-Barbera, Ruby-Spears, DiC, Marvel Productions, and Disney. Crew credits TV series A Pup Named Scooby-Doo 301(b). Dawn of the Spooky Shuttle Scare - written by 401. The Were-Doo of Doo Manor - written by 403. Mayhem of the Moving Mollusk - written by Retrieved from "https://scoobydoo.fandom.com/wiki/David_Schwartz?oldid=385235" Categories: A Pup Named Scooby-Doo writers Community content is available under CC-BY-SA unless otherwise noted.