Ashley Judd

Actress, Activist & Humanitarian

Ray Kurzweil

Chairman of Kurzweil Technologies, Inventor & Futurist; Author of "How to Create a Mind"

Dr. Michio Kaku

World-Renowned Futurist & Theoretical Physicist

Lisa Ling

Award-Winning Journalist & Producer for CBS News

Bill Nye

"The Science Guy"; Science Communicator, TV Presenter & Mechanical Engineer; Climate Change Activist

Alexis Ohanian

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

Alexis Ohanian Carthage College Commencement Address 2014

Sophia Bush

Actress, Humanitarian & Author

Winona LaDuke

Executive Director of Honor the Earth

Daniel Kraft, M.D.

Physician-Scientist; Founder of Exponential Medicine; Chair for Medicine & Neuroscience at Singularity University

Tensie Whelan

Director of NYU's Center for Sustainable Business; Former President of the Rainforest Alliance

Jason Clay

Senior Vice President of Food & Markets at WWF

Peter Thiel

Former CEO and Co-founder of PayPal; Technology Entrepreneur, Investor and Philanthropist

Ian Somerhalder

Actor Known for "The Vampire Diaries"; Animal & Environmental Advocate; Founder of The Ian Somerhalder Foundation

Caroline Casey

Founder of Kanchi & The Ability Awards

Dan Barber

Multi-Award-Winning Chef, Agronomist, Environmentalist, Author & Co-Owner of New York's Blue Hill Restaurant

Dan Barber - From Seed to Table - Aspen Ideas: Health 2023

Dean Kamen

Founder of FIRST; President of DEKA Research & Development Corporation

Bunker Roy

Founder of Barefoot College

Lamman Rucker

Actor, Education Activist, Green Living Advocate & Entrepreneur

Lisa Gansky

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

John Ratzenberger

Emmy-Nominated Actor, Entrepreneur & Philanthropist

Jody Williams

Humanitarian and Nobel Peace Prize Winner and Chairman of the International Campaign to Ban Landmines

Walter Robb

Food Retail Expert & Food Access Advocate; Principal at Stonewall Robb Advisors; Former Co-CEO of Whole Foods Market

Geoffrey West

Theoretical Physicist, Distinguished Professor & Past President of Santa Fe Institute

Amber Jenkins

Applied Science Engineer, NASA’s Jet Propulsion Laboratory; Editor, NASA Climate Change Website

Louie Schwartzberg

Award-Winning Cinematographer, Director, Photographer and Filmmaker

Ed Rendell

Former Governor of Pennsylvania; NBC News Political Analyst & Author

Mark Lynas

Environmental Writer; Author of "Our Final Warning: Six Degrees of Climate Emergency"

Amory Lovins

Co-Founder & Chairman Emeritus of Rocky Mountain Institute

James E. Hansen

Adjunct Professor Directing the Program on Climate Science, Awareness and Solutions of the Earth Institute at Columbia University; Former Director at NASA Goddard Institute for Space Studies

Blythe Danner

Emmy Award-Winning Actress & Activist