Career
Mearls wrote the adventure To Stand on Hallowed Ground/Swords Against Deception (2001) for Fiery Dragon Productions, : 226 and the last product from Hogshead Publishing, a Warhammer adventure titled Fear the Worst (2002) that Hogshead released for free on the internet. : 307 He also designed the game Iron Heroes (2005) for Malhavoc Press. : 226
In June 2005, Mearls was hired as a designer by Wizards of the Coast based on his work on third-party d20 products. : 301 Along with Andy Collins, David Noonan, and Jesse Decker, Mearls was part of the fourth edition Dungeons & Dragons "Flywheel" design team led by Rob Heinsoo, and this team was responsible for the final concept work from May 2006 to September 2006, before the first books for the edition were written and playtested. : 297 Between the fourth edition design phases titled "Orcus I" and "Orcus II", Mearls added the encounter-power mechanics of fourth edition into Tome of Battle: The Book of Nine Swords (2006), which was in process during development of the new edition. : 298 Heinsoo was laid off in 2009, so Mearls was made the new lead designer of Dungeons & Dragons. : 301 Following Collins departure from Wizards in May 2010, Mearls was promoted to Group Manager of the Dungeons & Dragons R&D team. Mearls oversaw the launch of 4th Edition's Essentials line; Shannon Appelcline, author of Designers & Dragons, commented that the new line was "primarily the brain child of Mike Mearls". Mearls also co-designed the Castle Ravenloft Board Game (2010) with Bill Slavicsek. : 302
In 2014, Mearls was a senior manager for Dungeons & Dragons research and development. Mearls was, together with Jeremy Crawford, Co-Lead Designer for the Fifth Edition of Dungeons & Dragons. By 2018, Mearls had become the franchise's Creative Director. He left the Wizards of the Coast tabletop RPG team in 2019 and was replaced by Ray Winninger as the Executive Producer in charge of the Dungeons & Dragons studio in 2020. Mearls went on to join the Exploratory and Vision design teams for Magic: The Gathering. He received "special thanks" in the credits for Baldur's Gate 3 (2023); in a 2019 interview, Mearls described his role as "story and system support". Mearls confirmed on Bluesky that he was laid off in December 2023.
In May 2024, Chaosium announced that Mearls was their new Executive Producer of role-playing games.
