Peter Girguis

Associate Professor of Natural Sciences at Harvard; Adjunct Research Engineer at the Monterey Bay Aquarium Research Institute

John Holdren

Professor of Environmental Policy & Director of the Program on Science, Technology, and Public Policy at the Harvard Kennedy School of Government

Bart Knols

Scientist, Author, Entrepreneur

Michael Archer

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

Dr. Hendrik Poinar

Evolutionary Biologist Specializing in Ancient DNA

Dr. Phil Plait

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

Ellen Stofan

Under Secretary for Science & Research at the Smithsonian; Former Chief Scientist at NASA

Eric Berlow

Data Ecologist, Complexity Scientist

Anil Ananthaswamy

Award-Winning Science Writer & Author of "The Edge of Physics"

Dr. Kirby Runyon

Space Exploration Leader & Zero Gravity Coach and Planetary Geologist, CEO of Planex.space

The Overview Effect at Home: Exploring Otherworldly Terrain With Space Tourists on Earth

Andrew Connolly

Astronomer

Paul Sutter

Astrophysicist; Host of “Ask a Spaceman” Podcast; Contributing Editor to Space.com; Producer

Penelope Boston

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

Bobak Ferdowsi

NASA's Jet Propulsion Labs Flight Director; Curiosity Rover Landing

Jacqueline Goldin

Extraordinary Associate Professor of Anthropology & Water Science at the University of Western Cape

David Grinspoon

American Astrobiologist, Senior Scientist at the Planetary Science Institute

Venus Revealed: A New Look Below The Clouds Of Our Mysterious Twin Planet

Monica Grady

British Space Scientist; Professor of Planetary and Space Science at the Open University; Chancellor of Liverpool Hope University

Mario Livio

Renowned Astrophysicist, Lecturer, and Best-selling Author

Konstantin Batygin

Professor of Planetary Science, Caltech

Peter Cattermole

Former Principal Investigator with NASA's Planetary Geology and Physics Program, Specialising on the Study of Volcanoes on Mars and Venus