Chainmail and Early D&D Len Lakofka was living in Chicago during the 1960s and was an avid wargamer. He was so interested in Avalon Hill's Diplomacy that he joined the International Federation of Wargamers. In 1968 Gary Gygax had talked the IFW into organizing a one-day wargame convention at the Horticultural Hall in Lake Geneva. By then Len was President. This would be the very first Gen Con. So he traveled to Lake Geneva to set up, run events, and clean up. After the convention ended Gary introduced a new set of miniatures rules to a few people including Lakofka. This game would later be published as Chainmail. Lakofka play-tested and gave advice on balancing the rules. In 1975 he was introduced to the new game developed by Gygax and Dave Arneson called Dungeons & Dragons. As a frequent play tester for both the original version and Advanced Dungeons & Dragon, he was very involved with the creation of the three core books for AD&D. He edited the Players Handbook