[1]: 424 Underkoffler has published his PDQ indie role-playing games through his company Atomic Sock Monkey Press, including the fairytale RPG, The Zorcerer of Zo,[1]: 424 and Truth & Justice in the superhero genre.
[citation needed] He also designed the horror fantasy game Dead Inside.
[2] Evil Hat Productions brought on Underkoffler to help with The Dresden Files Roleplaying Game in 2007.
[1]: 424 Leonard Balsera became the Lead System Developer for Dresden Files and Underkoffler took on the role of Lead Setting Developer, building on the work done by Genevieve Cogman.
[1]: 425 Underkoffler designed Swashbucklers of the 7 Skies (2009) for Evil Hat, which was a more traditional type of role-playing game than some of the other games the company had been releasing.