Stephen Kaufer, president and CEO

Prior to co-founding TripAdvisor, Kaufer was president of CDS, Inc., a successful independent software vendor specializing in programming and testing tools. Previously, Kaufer was co-founder and vice president of engineering of CenterLine Software, where he led the development of several award-winning programming environments that fueled the company's growth to more than $20 million in revenue. Kaufer, winner of the 2005 Ernst & Young Entrepreneur of the Year Award, holds several software patents and has spoken at dozens of travel and high-tech conferences worldwide. He is a board member of the Caring For Carcinoid Foundation (http://www.caringforcarcinoid.org) a non-profit charity dedicated to finding a cure for Carcinoid and Neuroendocrine cancers. He has a B.S. in computer science from Harvard University.

Christine Petersen, chief marketing officer

Petersen heads consumer marketing, product development and community support for TripAdvisor. Since joining in 2004, Petersen has overseen tremendous growth of site traffic, revenue, content and membership, including driving user involvement through the launch of rich product offerings such as maps, video, personalization and intra-member email. She joined TripAdvisor from Travelocity (formerly Preview Travel, Inc.), where she was vice president of member services and customer marketing. Petersen previously held senior marketing positions at Charles Schwab & Co., American Express, and Fidelity Investments. She holds an M.B.A. from Columbia University and a bachelor's degree from Colby College.

Marc Charron, managing director, Europe

Marc Charron is responsible for leading TripAdvisor's rollout of local language sites and managing operations across Europe. Prior to joining TripAdvisor, Charron served as vice president of product marketing at SquareTrade, Inc. in San Francisco. Before SquareTrade, Charron served as managing director of QXL.com, Getz International Travel and Danube Travel, all based in London. Charron began his travel career in 1991 with Carlson Travel in Vienna. He received a bachelor's degree from Trinity University in Texas and spent a year abroad studying at the London School of Economics.

Andy Gelfond, vice president, engineering

Andy Gelfond is responsible for leading TripAdvisor's engineering organization. Prior to joining TripAdvisor in 2004, Gelfond was founder and CTO of several Boston-based companies including InterGroup Technologies, LumaPath and Publish2Go, and was an architect and development manager for Lotus Development Corporation. Gelfond moved to the Boston area in 1988 after selling one of his companies, DeltaCom, to Index Technology. He attended the Moore School of Engineering, University of Pennsylvania.

Robin Ingle, senior vice president, advertising sales

Robin Ingle is responsible for all graphical and cost-per-click advertising sales as well as ad operations for TripAdvisor. She joined TripAdvisor in 2001 and most recently led international development. Prior to that, Ingle handled all client relations for the company. Before joining TripAdvisor, Ingle served as vice president of advertising at Access Media, vice president of sales for MediaPassage, and director of display advertising at the Chicago Sun-Times.

Eric Rosenzweig, senior vice president, strategic development and sales

Before joining TripAdvisor, Rosenzweig spent two years as executive vice president at SideStep and prior to that he was at Travelocity for two-and-a-half years, most recently as vice president of business and corporate development. Before Travelocity, Rosenzweig was with Preview Travel. Rosenzweig earned M.B.A. and J.D. degrees from the University of California, Berkeley and a bachelor of arts degree from Harvard University.

Tyler Young, vice president, finance and administration

Prior to joining TripAdvisor in 2004 as the company’s controller, Young spent seven years in public accounting with Deloitte & Touche, most recently as audit manager.  He is a certified public accountant and won the South Carolina Golden Quill award in 1999 for passing the CPA exam with the highest score in the state.  Young holds a B.A. in government and economics from Dartmouth College and continued his accounting education at the University of California, Berkeley and the University of South Carolina.