Kaufer co-founded TripAdvisor in 2000 with the mission to help travelers around the world plan and have the perfect trip. Under Kaufer's leadership, TripAdvisor has grown into the largest Web 2.0 company in the northeast and the world's largest travel site, with more than 50 million unique monthly visitors, 20 million members and over 50 million reviews and opinions. Kaufer has also built the TripAdvisor Media Group, acquiring 19 leading travel brands, and has expanded the TripAdvisor brand into 30 countries, including France, Germany, Greece, Italy, India, Japan, Russia, Spain, the U.K., Indonesia, Argentina, Taiwan, Malaysia, and Egypt. Kaufer and his co-founders sold TripAdvisor to InterActive Corporation in 2004, which later spun off its travel businesses to Expedia, Inc., and Kaufer has continued to run day-to-day operations. Prior to co-founding TripAdvisor, Kaufer was president of CDS, Inc., a successful independent software vendor specializing in programming and testing tools.