David R. Dow

David R. Dow has defended over 100 death row inmates in 20 years. He is the Cullen Professor at the University of Houston Law Center and the Rorschach Visiting Professor of History at Rice University.

Lisa Kristine

Internationally Recognized Fine-Art Photographer, Humanitarian & Activist

Molly Crockett

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

Gloria Allred

Renowned Women's Rights Attorney; Subject of Netflix Documentary "Seeing Allred"

Stacey Abrams

Political Leader, Voting Rights Activist & New York Times Bestselling Author

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.

Tyler DeWitt

Research Scientist; High School Teacher, Digital Content Author & STEM Education Advocate

Michael Stevens

YouTube Sensation; Best Known as Vsauce

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.

Darren Walker

President of the Ford Foundation; Chair of the US Alliance on Impact Investing

HOW Insights — NEW

Bill Gates

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

Edward Tenner

Smithsonian Institution Distinguished Scholar & Author of "Why Things Bite Back" and "Our Own Devices"

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

Penny Chisholm

Award-Winning Oceanographer & Professor, MIT

Professor Penny Chisholm on Earth Week

Michael Bodekaer

Technology Entrepreneur & Founder of Labster

Wilton Virgo

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

Phumzile Mlambo-Ngcuka

Under-Secretary-General & Executive Director of UN Women United Nations

Marla Spivak

Entomologist; Focused on Practical Applications to Protect Honey Bee Populations

Katherine Kuchenbecker

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

Laura Snyder

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

Read Montague

Neuroscientist & Popular Science Author

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.

Nicholas Burns

Professor of the Practice of Diplomacy & International Politics, Harvard Kennedy School

Clay Shirky

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

Jimmy Wales

Founder of Wikipedia & Wikitribune

Jeff Jarvis

Leader in the Development of Online News & Blogging; Director of the Tow-Knight Center for Entrepreneurial Journalism at CUNY

Steve Wozniak

Co-Founder of Apple Computer, Inc.