David is the founder and chairman of Roundhouse Technologies, a firm specializing in developing technologies surrounding social media and geography. David is a serial entrepreneur and has founded several technology firms including Popvox LLC and ToadNet, Inc, which he sold to Landmark Communications in 2004. David is a longtime contributor to the Asterisk open-source PBX project and has also created plugins for Ruby on Rails. In 2006, he developed an innovative distributed call center technology using Asterisk and Rails which volunteers used to reach out to over 1M voters. In 2007 he created Twittervision.com and Flickrvision.com, which are real-time visual representations of posts to Twitter and Flickr; both are on display at the Museum of Modern Art in New York. Roundhouse will launch openlocation.org, a site geared specifically for web application developers to work with location information, at Where 2.0. David lives with his family near Annapolis, Maryland and enjoys cooking and flying small airplanes.