Bernie Krause

Natural sounds legend; records the sounds of endangered biospheres.

David Doubilet

National Geographic Photographer & Founding Member of the International League of Conservation Photographers

Dianna Cohen

Visual Artist & Co-Founder of the Plastic Pollution Coalition

Ben Goldacre

Physician; Best-Selling Academic & Science Writer

Rebecca MacKinnon

Founding Director of Ranking Digital Rights

Yves Rossy

Military-Trained Pilot & Aviation Enthusiast

Anna Dietrich

‎Entrepreneur; Consultant; Speaker; COO & Co-Founder of Terrafugia, Inc.

Mikko Hypponen

Computer Security Expert; Chief Research Officer at WithSecure & Principal Research Advisor at F-Secure

If It's Smart, It's Vulnerable

Justin Hall-Tipping

The Energy Evangelist, Justin Hall-Tipping works on nano-energy startups -- mastering the electron to create power.

Todd Kuiken

Biomedical Engineering Manager at the Rehabilitation Institute of Chicago

David Suzuki

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

Dr. Gregory Stock

Healthcare Futurist & Biotech Pioneer

Alex Steffen

Author of "Carbon Zero: Imagining Cities That Can Save the Planet"

Michael Rogers

MSNBC's 'The Practical Futurist' & Technology Expert