TechMediaNetwork named Doug Llewellyn as Chief Operating Officer; Mike Kisseberth as Chief Revenue Officer; and John Potter as Chief Technology Officer. The appointments were announced by CEO of TechMediaNetwork Greg Mason. Mason, a former CBS Interactive, CNET and WebMD executive, joined TechMediaNetwork in December 2012. Servicing clients such as LAPTOP, SPACE and TopTenReviews, TechMediaNetwork delivers advertisers the scale of a highly engaged audience, premium tech and science content, and an e-commerce engine. TechMediaNetwork’s portfolio of Web brands combines to serve more than 49 million visitors per month worldwide.