Clark Daniel Rodeffer (*April 30, 1970) is an American game inventor. He designed numerous sowing games: Inchworm (2000), Tea Party (2001), Cow Poke (2005), Spectral Reapers (2006) and Zig Zag (together with Amanda J. L. Rodeffer, 2006), although he is best known for Pulling Strings, an entry in the 2003 Simultaneous Movement Game Design Competition. Two of his sowing games can be played online: Zig Zag on Richard's PBeM-server and Inchworm on Super Duper Games. Since 2001 Clark organizes an annual tournament of two-player abstract strategy games as part of "U-Con Gaming Convention" in Ann Arbor, a major gaming event in the USA.