Mr. Horowitz is a founding officer and has served as the Chairman of our board of directors, Chief Executive Officer and Treasurer since our inception in January 2003. Mr. Horowitz was previously a founder of Go2Net, a provider of online services to merchants and consumers, including merchant Web hosting, online payment authorization technology, and Web search and directory services. He served as its Chairman and Chief Executive Officer from its inception in February 1996 until its merger with InfoSpace in October 2000, at which time Mr. Horowitz served as the Vice Chairman and President of the combined company through the merger integration process. Additionally, Mr. Horowitz served as the Chief Financial Officer of Go2Net from its inception until May 2000. Prior to Go2Net, Mr. Horowitz served as the Chief Executive Officer and a director of Xanthus Management, LLC, the general partner of Xanthus Capital, a merchant bank focused on investments in early-stage companies, and was a founder and Chief Financial Officer of Active Apparel Group, now Everlast Worldwide. Mr. Horowitz received a B.A. in Economics from Columbia College of Columbia University.

Mr. Berk has served as our Executive Vice President of Product Engineering, overseeing the development of all of Marchex’s local search and performance advertising products, since December 2008. Prior to his current role he served as Marchex’s Lead Search Architect and Vice President of Search. Mr. Berk joined Marchex from Open List, which was acquired by Marchex in May 2006, where he was co-founder and Chief Technology Officer. Prior to Open List, he was a research director at Jupiter Research, where he focused on coverage of search technology and Web operations and infrastructure. Mr. Berk holds a master’s degree from The Johns Hopkins University, where he was an Andrew W. Mellon Fellow in Humanistic Studies, and a BA, summa cum laude, from Cornell University.

Mr. Christothoulou is a founding officer and has served as our Chief Operating Officer since March 2009 and as our Chief Strategy Officer from our inception in January 2003 until February 2009. From January 2001 to December 2002, Mr. Christothoulou reviewed, together with the other founding officers, new business opportunities in the retail, media, finance and technology industries. Mr. Christothoulou was previously the Senior Vice President of Strategic Initiatives for Go2Net, focused on strategic acquisitions and investments, from January 2000 until its merger with InfoSpace in October 2000, at which time he served as the Senior Vice President of Corporate Strategy and Development of the combined company through the merger integration process until January 2001. Prior to Go2Net, Mr. Christothoulou was a Vice President in the Investment Banking Group of U.S. Bancorp Piper Jaffray, focused primarily on merger and acquisition advisory services for technology companies, and was with the investment banking firm from 1996 until January 2000.

Mr. Turner joined Marchex in October 2009 and is responsible for Marchex’s call-based products. Prior to joining Marchex, he was General Manager of Search and Media Network for Microsoft. Mr. Turner joined Microsoft in 2007 through the acquisition of aQuantive, where he held numerous roles over eight years, including Vice President of Operations for Avenue A (Razorfish), Founder and Vice President of Atlas’ Publisher division, and Founder and Vice President of aQuantive’s Vertical Networks product group. Mr. Turner received a B.S. in Electrical Engineering from the University of Memphis and an MBA from Vanderbilt University.