Gaider began his professional life in the service industry, eventually managing a small hotel, while game designing was a side hobby to him. In 1999, a friend who worked as an artist at a local game studio named
BioWare (at that point having only recently achieved success with the release of ''
Baldur's Gate) suggested to the studio founders, Ray Muzyka and Greg Zeschuk, that Gaider be given a newly-available position in the design department. Gaider got the job and, as his first assignment, was handed the task of writing for Baldur's Gate II: Shadows of Amn''. The release of that title in 2000 was a great success for BioWare and cemented the studio as a major developer of role-playing games. Gaider then worked on
Neverwinter Nights (released in 2002) and
Star Wars: Knights of the Old Republic (2003), for which he wrote the characters HK-47 (winner of the 2004 Game Developers Choice Awards for "Original Game Character of the Year"), Jolee Bindo, and Carth Onasi. An expansion for
Neverwinter Nights, called
Neverwinter Nights: Hordes of the Underdark, was the first title on which Gaider served as lead writer, responsible for the game's overall narrative design and managing the project's writers. Gaider then assumed the role as lead writer on BioWare's new
fantasy game,
Dragon Age: Origins, which was released in 2009. He was also credited with the creation of the
Dragon Age setting, the world of Thedas. He was responsible for the writing of the characters of Zevran, Alistair, Morrigan, and Shale, as well as the writing of the major quests, "Nature of the Beast" and "Redcliffe". Gaider also wrote the prequel novels to
Origins,
The Stolen Throne and
The Calling, both released in 2009. Afterwards, Gaider continued to serve as lead writer in the expansion
Dragon Age: Origins - Awakening (2010) and then the sequel game,
Dragon Age II. In
Dragon Age II (2011), Gaider is credited with writing the characters
Cassandra Pentaghast, Fenris, and Knight-Commander Meredith. He then penned the follow-up novel
Asunder, which was released on 20 December 2011. In 2012, Gaider was the lead writer of
The Silent Grove, a six-part comic series published by
Dark Horse Comics.
The Silent Grove was followed by its narrative sequels,
Those Who Speak and
Until We Sleep, also written by Gaider. Gaider was again lead writer for
Dragon Age: Inquisition, released in 2014, the third game in the
Dragon Age series. The game won a number of major awards, including the prestigious DICE Award from the Academy of Interactive Arts & Science, as well as being selected by several gaming publications, including
IGN,
Game Informer, and
Polygon (website) as their Game of the Year. According to
Electronic Arts' fiscal 2015 third quarter earnings report,
Dragon Age: Inquisition is the most successful launch in BioWare history based on units sold. In early 2015, Gaider moved on to writing the story of
Anthem. After Gaider's departure from Bioware the story was rewritten. On 22 January 2016, Gaider left BioWare after 17 years in the company. In February 2016, he announced that he would assume a position as Creative Director at
Beamdog, a studio known primarily for releasing updated versions of
BioWare and
Black Isle Studios role-playing titles. He left Beamdog in February 2018. In 2019, Gaider co-founded Summerfall Studios, a
Melbourne, Australia-based indie game company. The new studio's first project is
Chorus: An Adventure Musical, funded both by Creative Victoria and a successful crowdfunding campaign on the
Fig platform, which earned $690,079 USD from 6,018 backers as of November 10, 2019. The project was renamed to
Stray Gods: The Roleplaying Musical by 2022, with Gaider still attached as Creative Director. The game was released in August 2023. ==Personal life==