Madison Dearborn Partners, LLC - Focus: management buy-outs, growth equity financing, recapitalization and acquisition-oriented financing.


John Lewis

Executive Partner


Prior to partnering with MDP in 2017, Mr. Lewis most recently served as Global President of Nielsen Holdings PLC (NYSE: NLSN), where he oversaw the Global “Buy” business and the ex-U.S. “Watch” business, which comprised approximately 2/3rds of Nielsen's $6 billion of revenue. Mr. Lewis previously ran the North American “Buy” business, and both the Latin American “Buy” and “Watch” businesses, leading each of these segments to both accelerated revenue growth and enhanced profitability. During his time at Nielsen, Mr. Lewis completed and successfully integrated more than 10 strategic acquisitions. Prior to Nielsen, Mr. Lewis was CEO of Knowledge Networks, a venture capital-backed start-up where he succeeded the founding CEO and led its transformation into a more differentiated provider of specialized market research. Mr. Lewis also held an earlier role at Nielsen, where he was the Chief Marketing Officer and the #2 executive in the North American business turnaround from 1995-1999. Prior to his career in information services, Mr. Lewis led the Consumer Products division at The NutraSweet Company.

Please note that John Lewis is not an employee, officer or affiliate of MDP.


B.A., Princeton University; M.B.A., Northwestern University J.L. Kellogg School of Management
Lewis, John