What is the name of the American game designer who co-developed Dungeons & Dragons Basic Set and who developed the concept of the RPG?
Dungeons &amp; Dragons Basic Set: The Dungeons & Dragons Basic Set is a set of rulebooks for the "Dungeons & Dragons" ("D&D") fantasy role-playing game. Dungeons &amp; Dragons Basic Set:  First published in 1977, it saw a handful of revisions and reprintings. Dungeons &amp; Dragons Basic Set:  The first edition was written by J. Eric Holmes based on Gary Gygax and Dave Arneson's original work. Dave Arneson: David Lance "Dave" Arneson (October 1, 1947 – April 7, 2009) was an American game designer best known for co-developing the first published role-playing game (RPG), "Dungeons & Dragons", with Gary Gygax, in the early 1970s.
Dave Arneson