Dr. Mehmet Oz

Cardiothoracic Surgeon; Host of "The Dr. Oz Show;" Columbia University Professor & Author

Sir Richard Branson

Businessman & Founder of Virgin Group

Oprah Winfrey

CEO of Oprah Winfrey Network, Presidential Medal of Freedom Recipient & National Women's Hall of Famer

Mark Zuckerberg

Founder & CEO of Facebook

George Soros

Chairman of Soros Fund Management LLC, Founder of Open Society Foundations & Philanthropist

Tom Hanks

Actor, Producer, Writer & Director; Known For "Forrest Gump"

Sergey Brin

Co-Founder of Google & President, Alphabet Inc.

James Cameron

Founder and Executive Vice Chairman, Climate Change Capital

Christo Greyling

Director, HIV and Infectious Diseases, World Vision International

Dionne Warwick

Grammy Award-Winning Singer, Actress & TV Host

Anna Kendrick

Award-Winning Actress, Singer & Author

Tony Robbins

Entrepreneur, Bestselling Author & Peak Performance Strategist

Sergey Brin and Larry Page

Sergey Brin and Larry Page invented Google: the technology, the company, the verb.

Ricky Gervais

English Comedian & Actor; Known for "The Office" and "Extras"

Marc Benioff

Founder, Chairman & CEO of Salesforce.com

Sara Blakely

Founder & CEO of SPANX

Sheryl Sandberg

COO of Facebook, Bestselling Author & Founder of Leanin.org

Peter Diamandis

Founder & Executive Chairman of the XPRIZE Foundation; Author; Named One of The World's 50 Greatest Leaders

Bill Gates

Co-Founder of Microsoft; Co-Chair of the Bill & Melinda Gates Foundation

How to Avoid a Climate Disaster: The Solutions We Have and the Breakthroughs We Need

Michael Lewis

Best-Selling Author of "The Fifth Risk", "Moneyball", and "The Big Short"

The Premonition: A Pandemic Story