Peter Diamandis

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

Alexis Ohanian

Co-Founder of Initialized Capital & Co-Founder of Reddit; Entrepreneur, Investor, Activist & Bestselling Author

Alexis Ohanian Carthage College Commencement Address 2014

Jacqueline Novogratz

Founder & CEO of Acumen Fund

Ashley Rhodes-Courter

International Child Welfare Advocate, Master of Social Work, Foster Parent & Author of the Best-Selling Memoir "Three Little Words"

Kanya Balakrishna

Co-Founder & CEO of The Future Project; Youth Empowerment & Education Advocate

Ashley Michelle Berry

Anti-Bullying Advocate, Actress, TV & Radio Host

Janine di Giovanni

Author, Award-Winning Foreign & War Correspondent; Visiting Fellow at Yale Law School & Executive Director The Reckoning Project

John Legend

EGOT Winning Musician, Producer & Philantropist

Amy Purdy

Former "Dancing with the Stars" Contestant & Paralympic Professional Snowboarder

Dan Ariely

Behavioral Economist; Professor at Duke University; Author; Founding Member of The Center for Advanced Hindsight

Rev. Jamal Harrison Bryant

Founder of The Empowerment Temple

Melinda French Gates

Co-Chair of the Bill & Melinda Gates Foundation

Melinda French Gates' Brief But Spectacular take on making birth ...

Michelle Obama

Former First Lady of the United States & Bestselling Author

Bob Goff

Founder of Love Does; New York Times Bestselling Author

Oprah Winfrey

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

Oprah Winfrey: Broken Open | Oprah's Super Soul | OWN Podcasts ...

Lauren Bush

Founder & CEO of FEED Projects; Model & Fashion Designer; Granddaughter of Former President George H. W. Bush

Porter Gale

Bestselling Author of "Your Network Is Your Net Worth" & Former Vice President of Marketing at Virgin America

Ben Rattray

Founder & Executive Chair of Change.org

Mariska Hargitay

Emmy Award-winning Actress & Philanthropist; Known for "Law and Order: Special Victims Unit"

Ashton Kutcher

Actor, Producer, Investor & Activist

Steve Harvey

TV Personality & Host of "Family Feud"

Lisa Gansky

Corporate Advisor, Marketing Expert & Author of "The Mesh: Why the Future of Business Is Sharing"

Josh McDowell

Christian Apologist, Evangelist & Best-Selling Author

Tim Tebow

ESPN College Football Analyst; Heisman Trophy Winner; Former Quarterback for NFL's Denver Broncos & Baseball Outfielder for the New York Mets

Pharrell Williams

Singer-Songwriter, Producer & Entrepreneur; Known for the Hit Single, "Happy"

Alice Waters

Executive Chef, Founder & Owner of Chez Panisse; Sustainable Agriculture Advocate

Wendy Kopp

CEO of Teach For All & Founder of Teach For America; Childhood Education Advocate

Emma Watson

Actress, Model & Activist; UN Women Goodwill Ambassador; Co-Founder of the HeForShe Campaign

Pastor Rick Warren

Pastor & Author of "The Purpose-Driven Life"

Aaron Hurst

CEO of Imperative, Expert on the Science of Purpose at Work, Globally Recognized Social Entrepreneur & Author of "The Purpose Economy"