Dungeons & Dragons is a 31-book series with 31 released primary works first released in 1950 with contributions by Jim Zub, Alexander C. Irvine, Don Bassingthwaite, James Wyatt, Matthew Beard, Richard Henry Dana, E. Gary Gygax, Dave Arneson, Tom Moldvay, David Zeb Cook, Frank Mentzer, Gary Gygax, Aaron Allston, Jonathan Tweet, Monte Cook, Skip Williams, Wizards of the Coast, Rob Heinsoo, Andy Collins, Mike Mearls, Robin D. Laws, Greg Gorden, Greg Bilsland, Robert J. Schwalb, Jeremy Crawford, Matt Sernett, Steve Townshend, Rodney Thompson, Peter Lee, Bruce R. Cordell, Christopher Perkins, Ben Petrisor, F Wesley Schneider, and Ray Winninger.