Mark Jacobs is a game designer, programmer, author and businessman, and the former GM/VP/CEO of Mythic Entertainment, Inc. He created two early MUDs, Aradath and Dragon's Gate serving as both the designer and programmer in addition to his duties as President/CEO. He founded A.U.S.I. (Adventures Unlimited Software Inc.) in 1983 and worked on a number of computer games for systems such as the Apple II.