Rick Ridgeway

Environmentalist, Mountaineer, Expedition Author, VP of Environmental Initiatives & Special Projects at Patagonia

Greg McKeown

CEO of THIS Inc. & Best-Selling Author of "Essentialism: The Disciplined Pursuit of Less"

Ruby Payne

Founder of aha! Process, Inc. & Author of "A Framework for Understanding Poverty"

Leonard Mlodinow

Theoretical Physicist, Author, Recognized for Groundbreaking Discoveries in Physics

Dr. Samantha Nutt

Medical Doctor, Award-Winning Humanitarian, Bestselling Author & Founder of War Child USA

Dr. Samantha Nutt on Now This

Dr. Tali Sharot

Leading Expert on Human Decision-Making & Optimism; Cognitive Neuroscientist & Author

John Zogby

Trendspotter & Leading Pollster

Raj Patel

Award-Winning Writer, Food Politics Activist, Filmmaker & Academic

David Suzuki

Environmentalist & Scientist; Co-Founder of the David Suzuki Foundation

Rachel Simmons

Internationally Recognized Educator & Best-Selling Author

Bobby Seale

Political Activist & Co-Founder of the Black Panther Party

Michael Rogers

MSNBC's 'The Practical Futurist' & Technology Expert

John Nance

New York Times Best-Selling Author

Ralph Nader

Former Presidential Candidate for the Green Party, Consumer Advocate & Independent

Warren MacDonald

Adventurer, Author & Motivational Speaker; Double Above the Knee Amputee

Bjorn Lomborg

Political Scientist & Author of "The Skeptical Environmentalist"

Alfie Kohn

Author & Speaker on Human Behavior, Education, & Parenting; Outspoken Critic of Education's Fixation on Grades

Josh Klein

Hacker & Author of "Hacking Work"

Immaculée Ilibagiza

Author, "Left to Tell: Discovering God Amidst the Rwandan Holocaust"

Tommy Spaulding

Former President & CEO of Up with People, World-Renowned Leadership Speaker & Author of "It's Not Just Who You Know"