President, North America Buy

John Lewis serves as President of the North American Buy division of Nielsen. In this role since 2006, John is responsible for the management, business performance and strategic direction of Nielsen's Buy group in the U.S. and Canada. From 1994 to 1999, John served as Executive Vice President, Marketing, ACNielsen USA. During his tenure, he improved the marketing function, accelerated product development, helped restore ACNielsen's competitive leadership position and successfully launched new products.

Between these two roles at Nielsen, John was President and CEO of Knowledge Networks, a venture-backed marketing information company. Knowledge Networks is a leader in the online marketing survey research space. John led the company from start-up to a growing leader in this segment of the industry.

Prior to Knowledge Networks, John ran another venture-backed start-up as President and CEO of SMS Technology, an innovative provider of packaging to the Consumer Packaged Goods industry. Earlier in his career, John was one of the first employees of The NutraSweet Co., where he held a number of executive positions including General Manager of the Consumer Products Division and Chief Marketing Officer.

John holds a Master's of Business Administration degree from Northwestern University's Kellogg School of Management and an undergraduate degree in Political Science from Princeton University.