Alex Steffen

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

Ben Goldacre

Physician; Best-Selling Academic & Science Writer

Bernie Krause

Natural sounds legend; records the sounds of endangered biospheres.

Carlo Ratti

Architect & Engineer; Director of MIT's SENSEable City Lab; Founding Partner of Carlo Ratti Associati

Catherine Mohr

Vice President of Strategy at Intuitive Surgical & President of the Intuitive Foundation; Medical Tech Start-Up Advisor

Debbie Sterling

Tech Engineer & Founder and CEO of GoldieBlox; Advocate for Women in STEM

Don McMillan

Corporate Comedian Known for his 'Nerdy' Sense of Humor

James McLurkin

Roboticist, Inventor, Researcher & Teacher

Jeffrey Kluger

Journalist; Editor and Writer at TIME MAGAZINE. Author of 8 books, including APOLLO 13.

José M. Hernández

Former NASA Astronaut, Engineer, Former Candidate for U.S. Congress & Author

Justin Hall-Tipping

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

Keller Rinaudo

Co-founder and CEO of Zipline

Talks at GS with Keller Rinaudo Cliffton, CEO and Co-founder of ...

Leland Melvin

Engineer, Former NASA Astronaut & Former NFL Wide Receiver

Maria Bezaitis

Intel Fellow, Chief Architect of Socio-Technical Systems & Expert on Technology Innovation

Mikko Hypponen

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

If It's Smart, It's Vulnerable

Rebecca MacKinnon

Founding Director of Ranking Digital Rights

Steven Squyres

Scientific Investigator, NASA

Todd Kuiken

Biomedical Engineering Manager at the Rehabilitation Institute of Chicago

Yves Rossy

Military-Trained Pilot & Aviation Enthusiast