Penelope Boston

Speleologist; Associate Director of the National Cave and Karst Research Institute

Alyssa Carson

Youngest Ever Astronaut in Training; Space Travel Enthusiast

Aprille Ericsson

Rocket Scientist; Technologist & STEM Educator

James E. Hansen

Adjunct Professor Directing the Program on Climate Science, Awareness and Solutions of the Earth Institute at Columbia University; Former Director at NASA Goddard Institute for Space Studies

Gwynne Shotwell

President & COO of SpaceX

SpaceX's president: Failures prepared us to fly our first passengers

Julia Bacha

Award-Winning Documentary Filmmaker, Creative Director at Just Vision

Tara Ruttley

Associate Chief Scientist for Microgravity Research at NASA Headquarters; Aquanaut

NASA Now: Expedition 26

Thomas D. Jones, PhD

Former NASA Astronaut & Planetary Scientist; Author

Guion Bluford

Former NASA Astronaut & First African-American In Space

Robert Zubrin

Aerospace Engineer, Best-Selling Author & Founder of Pioneer Astronautics

Bunker Roy

Founder of Barefoot College

Amber Jenkins

Applied Science Engineer, NASA’s Jet Propulsion Laboratory; Editor, NASA Climate Change Website

Diana Trujillo

NASA Aerospace Engineer & Mission Lead for the Mars Curiosity Rover; STEM Education Advocate

Jennifer Eigenbrode, Ph.D.

Research Scientist; NASA Goddard Spaceflight Center

Lee Cronin

With his research group, Lee Cronin is investigating the emergence of complex self-organising chemical systems -- call it inorganic biology.

Alison Gopnik

Professor & World Leader in Children's Learning and Development

Ben Kacyra

Ben Kacyra is the founding director of CyArk, a nonprofit engaged in 3D digital preservation of cultural heritage sites worldwide.

Andrew Connolly

Astronomer

Emily Calandrelli

Aerospace Engineer; Host & Producer of FOX's "Xploration Outer Space"

Dottie Metcalf-Lindenburger

Former NASA Astronaut; Educator & Earth Scientist