The GameMastery Guide, a Pathfinder Roleplaying Game rule book, written by Cam Banks, Wolfgang Baur, Jason Bulmahn, Jim Butler, Eric Cagle, Graeme Davis, Adam Daigle, Joshua J. Frost, James Jacobs, Kenneth Hite, Steve Kenson, Robin Laws, Tito Leati, Rob McCreary, Hal Maclean, Colin McComb, Amber Scott, F. Wesley Schneider, Sean K Reynolds, Russ Taylor, Penny Williams, Skip Williams, Teeuwynn Woodruff, Jason Nelson, David Noonan, Richard Pett, Rich Redman, Doug Seacat, Mike Selinker, Lisa Stevens, and James L. Sutter, was released in June 2010.