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Kathleen Sebelius is one of America’s leading voices on health policy, health care reform, and human service delivery. As Secretary of the United States Department of Health and Human Services from April 2009 through June 2014, she led the charge for the passage of the Affordable Care Act, the most significant health reform in half a century.

At the cutting edge of industrial innovation, JB Straubel is part of the founding team and the Chief Technical Officer of Tesla Motors, the electric car company based in Palo Alto, California. At Tesla, Straubel oversees the technical and engineering design of the vehicles. In addition to his work at Tesla, Straubel is also on the Board of Directors for Solar City. He is a lecturer at his alma mater, Stanford University, where he teaches the popular Energy Storage Integration class in the Atmosphere and Energy Program. Prior to Tesla Motors, Straubel was the CTO and co-founder of Volacom, where he co-invented and patented the new long-endurance hybrid propulsion concept that was later licensed to Boeing.

Nate Silver has become today's leading statistician through his innovative analyses of political polling. He first gained national attention during the 2008 presidential election, when he correctly predicted the results of the primaries and the presidential winner in 49 states. In 2012, he called 50 of 50 states. Today, Nate is pioneering the new field of data journalism with his award-winning website FiveThirtyEight, now co-produced with ESPN.

A leading voice calling for reforms in health care, Dr. David Newman offers bold new ideas on how to restore access, quality and efficiency as the sovereign forces in health care. His website, theNNT.com, has dozens of contributors analyzing the available studies and trial data to individualize the value of health treatments. They crunch the numbers on the benefits and harms, and then post the results. Here is David's speech on theNNT.com. David is an engaging, deeply researched and eloquent speaker on a topic that lies at the center of today's social concerns.

Steven Johnson's work on the history of innovation has inspired a six-part series that explores the power and the legacy of great ideas. The PBS series HOW WE GOT TO NOW with Steven Johnson premieres Oct 15, 2014. Discover the extraordinary in just about everything ordinary. Hear the stories behind the remarkable ideas that made modern life possible, the unsung heroes who brought them about and the unexpected and bizarre consequences each of these innovations triggered. View the series trailer here. Watch Steven's appearance on The Daily Show with Jon Stewart.