Mark D. Kingdon

Mark Kingdon is an American angel investor. He has invested in companies such as Twitter, SAY Media, Kidzui, 140 Proof, NiftyThrifty, and Fab.com. Previously, he spent two years as CEO of Linden Lab, having served from May 2008 to June 2010.
Prior to that, Kingdon was CEO of Organic Inc, a digital marketing agency, from 2001–2008. He led the company immediately following its 2000 IPO, through privatization and sale to agency holding company Omnicom.