Penny Chisholm

Award-Winning Oceanographer & Professor, MIT

Professor Penny Chisholm on Earth Week

Wilton Virgo

Laser Spectroscopist & Author of "Quantum Mechanics in Everyday Life"

Michael Archer

Paleontologist Michael Archer is working to bring back his favorite extinct animal: the Tasmanian tiger.

Mitch Resnick

Mitchel Resnick is LEGO Papert Professor of Learning Research, Director of the Okawa Center, and Director of the Lifelong Kindergarten group at the MIT Media Lab.

Laura Snyder

Professor; Science Historian; Philosopher; Author of "The Philosophical Breakfast Club"

Olympia LePoint

Former NASA Rocket Scientist, Author, TED Speaker & Artificial Intelligence Ethics Professor

Clay Shirky

Expert on New Technology & Social Media, & How They Shape Culture; Professor & Distinguished Writer in Residence, NYU

Aaron Ahuvia

Professor of Marketing and Author of "The Things We Love: How Our Passions Connect Us and Make Us Who We Are"

The Things We Love: How Our Passions Connect Us and Make Us Who We Are

David J. Brenner

Director of the Columbia University Center for Radiological Research

Scott Shellstrom

Creativity Innovator, Award Winning Creative Director & Keynote Speaker

Dr. Eric Scerri

UCLA Chemist, Author, Educator, Historian and Philosopher of Science

Marla Spivak

Entomologist; Focused on Practical Applications to Protect Honey Bee Populations

Bart Knols

Scientist, Author, Entrepreneur

Molly Crockett

Globetrotting Neuroscientist investigating altruism, morality and economic decision-making.

Katherine Kuchenbecker

Assistant Professor in the Mechanical Engineering and Applied Mechanics Department, with membership in the Bioengineering Graduate Group at the University of Pennsylvania.

David Moinina Sengeh

Minister Of Basic and Senior Secondary Education & Chief Innovation Officer for the Government of Sierra Leone

Thom Mason

Laboratory Director, Oak Ridge National Laboratory

David Thornburg

Award-Winning Futurist, Author & Educational Consultant

Daniel Pauly

Daniel Pauly is the principal investigator at the Sea Around Us Project, which studies the impact of the world's fisheries on marine ecosystems. The software he's helped develop is used around the world to model and track the ocean.

Paul Snelgrove

Paul Snelgrove led the group that pulled together the findings of the Census of Marine Life -- synthesizing 10 years and 540 expeditions into a book of wonders.

Read Montague

Neuroscientist & Popular Science Author

Bill Gates

Co-Founder of Microsoft; Co-Chair of the Bill & Melinda Gates Foundation

Fiorenzo Omenetto

Professor of Biomedical Engineering; Physicist

Bunker Roy

Founder of Barefoot College

Dr. Phil Plait

Blogger for Discover Magazine at Bad Astronomy, where he deconstructs misconceptions and explores the wonder of the Universe.

Thomas Pogge

Philosopher Thomas Pogge wants to ensure medications get to those who need it most. He has published on a wide range of subjects such as global justice and human rights.

John Zogby

Trendspotter & Leading Pollster

Jeffrey Kluger

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

Chimamanda Ngozi Adichie

Renowned African Novelist & Speaker

Jimmy Wales

Founder of Wikipedia & Wikitribune