John is responsible for helping Zilliant accelerate its investments in product, go-to-market and other means of helping customers succeed. John is an Executive Partner at Madison Dearborn Partners, where he leads investments in software-led data analytics investments for the firm. He and MDP have built a leader in the Customer Experience Software and Analytics space (InMoment) via four integrated acquisitions and a set of growth and efficiency investments, and Lewis serves as Executive Chairman. Prior to his time at MDP, Lewis was Global President of Nielsen Holdings, PLC, the largest Marketing Information and Analytics firm globally. At Nielsen, 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.