Short answers, pulled from the story.
David Noonan began his tenure with Wizards of the Coast in 1998. He contributed to the development of Dungeons and Dragons third edition and helped build the foundation for millions of players.
David Noonan was at the center of the Flywheel creative engine between May 2006 and September 2006. He worked alongside Andy Collins, Mike Mearls, and Jesse Decker to finalize concept work under the direction of Rob Heinsoo.
David Noonan was laid off from his employment with Wizards of the Coast on the 2nd of December 2008. This event marked the end of his direct involvement in the core development of the game.
David Noonan joined NCsoft West to work on the westernization of the massively multiplayer online game Aion. He later moved to En Masse Entertainment to assume the role of Lead Writer for the game TERA.
David Noonan contributed to the Hero Builder Guidebook in 2000 and the Sword and Fist in 2001. He spent five months editing and designing the third edition Manual of the Planes and contributed to the core trio of the Player Handbook, Monster Manual, and Dungeon Master Guide.