Dave Arneson, born in 1947, an American game designer, teacher and entrepreneur and the co-creator of the seminal Dungeons & Dragons role-playing game, passed away on Tuesday, April 7, after a long battle with cancer. He is survived by his wife and daughter.
Arneson was introduced to table-top wargaming in the early '60s by his parents, who bought him a copy of Avalon Hill's Gettysburg game. In college at the University of Minnesota, he met other wargamers and began both modifying existing games and designing his own. He attended the second official Gencon and there met a similarly youthful Gary Gygax. Gygax had published a set of 1:1 scale miniatures rules called Chainmail, which became the bare bones of an ongoing campaign that Arneson ran for friends called Blackmoor.
In 1974, Arneson and Gygax wrote up the rules they had evolved for their fantasy role-playing campaigns, creating the game Dungeons & Dragons. After failing to get any mainstream publishers interested, they created a company, TSR, and published the book themselves using investment money provided by one of Gygax's friends. The book became a hit, first in the wargaming community and then in the mainstream. Dungeons & Dragons not only created a new type of gaming, role-playing, but laid the foundation for the entire hobby gaming industry.
Arneson left TSR in 1979 and filed a lawsuit against the company. As a part of the ultimate settlement of that suit, neither Arneson nor Gygax ever spoke about what drove them apart, although Arneson would later return to TSR when Gygax was briefly president of the company again in the mid-'80s. They were on good terms at the time of Gygax's death last year.
In his post-D&D;/TSR life, Arneson founded a computer game company 4D Interactive Systems, which is still in business. He did computer consulting. In the late '90s, he became a teacher at Full Sail, a private university that teaches media and computer careers. He suffered a stroke in 2002, but kept teaching until 2008. Throughout these years he continued to work on his original Blackmoor role-playing campaign, publishing it in various paper forms and also creating an online role-playing community.
He is a member of Academy of Adventure Gaming Arts and Design Hall of Fame.
Grognardia editor James Maliszewski received the following note from Dave Arneson's family:
Dave Arneson.
Dave Arneson, co-creator of the first roleplaying game, ''Dungeons and Dragons'', died on Tuesday of cancer, at the age of 61.

A close friend of Arneson, Bob Meyer, reported on April 5 that he had taken a turn for the worse and was admitted to a hospital.  Family later confirmed that he was in a facility "where we can focus on keeping him comfortable."  Reported at that time, the doctor indicated that he had days to live.

The Academy of Adventure Gaming Arts and Design in 1984 inducted Arneson  into their Hall of Fame.  Pyramid Magazine in 1999 named him as one of The Millennium's Most Influential Persons, "at least in the realm of adventure gaming".

Arneson started out as a wargamer including naval games. He soon developed some for his personal use due to the major publishers' slow release of games.  With David Wesley and the other members of the Midwest Military Simulation Association, Arneson developed the basis of modern role-playing games with individual miniatures representing one person and having non-military objectives.  

Arneson attended the University of Minnesota as a history student.  He was a founder, along with Gary Gygax, of the Castle & Crusade Society as a medieval miniature chapter of the International Federation of Wargamers.  With Gygax in 1972, he authored ''Don't Give Up the Ship!'', a naval wargame.

Arneson's ''Blackmoor'' was the first role-playing game, a genre in which players describe their characters in thorough detail and can attempt almost any action the character plausibly could.  Ernest Gary Gygax, then a close friend of Arneson, worked with him during 1972–73 to develop the extensive set of rules (in this case three volumes) that such a game requires.  This became the first edition of ''Dungeons & Dragons''.  With his experience with David Wesley, Arneson tried it with fantasy miniatures free style calling his game, ''Blackmoor''.  He then latched on Gygax's ''Chainmail'' miniature game and Fantasy supplement for resolution of battles.  He showed Gygax what he was doing.  Gygax got involved and started preparing a set of rules to supplement ''Chainmail''.  They shopped the game, ''Dungeons & Dragons'', around to various gaming companies but got turned down.  Gygax started a business partnership, Tactical Studies Rules, to publish the game in 1974.  The game launched a whole new category in gaming. 

Although not involved with rulebooks for later editions of ''D&D'', Arneson did create adventure modules for later editions.