Mary Roach

TED Speaker & Author Known for "Packing For Mars"

Josh Tickell

America's #1 Expert on the Millennials generation. Creator, Director and Star of the movie "FUEL"

Jennifer Pahlka

Deputy Chief Technology Officer At The White House Office of Science and Technology Policy; Founder of Code for America

Recoding America: Why Government Is Failing in the Digital Age and How We Can Do Better

Charles Best

Founder and Former CEO, DonorsChoose.org

From Classroom To Crowdfunding

Harvey Mansfield

Political Philosopher, Author & Distinguished Professor

Soleil Moon Frye

Social Media Expert, Entrepreneur & Eco-Leader; Author of "Happy Chaos"; Alzheimer's Awareness Advocate

Sebastian Copeland

Adventurer, Environmental Activist, Award-Winning Photographer, Author, Lecturer & Founder of the Sedna Foundation

Bob Schieffer

Former Moderator of “Face The Nation” & Chief Washington Correspondent for CBS News

Sean Casey

Filmmaker & Storm Chaser; Creator of "Tornado Alley" and "Extreme Weather"

Betsy Myers

Women’s Business & Leadership Expert; Author of "Take the Lead;" Former Senior Political Advisor

Andy Serwer

Managing Editor, Fortune Magazine

Phylise H. Banner

Learning Experience Designer & Consultant

#TechLearnTips with Phylise Banner — Throw Away the Instructions

Lisa Kristine

Internationally Recognized Fine-Art Photographer, Humanitarian & Activist

Morgan Webb

Journalist & Personality in the Video Gaming Industry

Herbert "Hugh" Thompson

CTO of Symantec; Program Committee Chairman of RSA Conference

Anant Agarwal

CEO of edX & Professor at MIT

Donna Shirley

Management Consultant & Author; Former Manager of the Mars Exploration Program

Grace Helbig

Comedian, YouTube Personality, Actress & Author

Sarah Lacy

Technology Journalist; Founder & CEO of PandoMedia and Chairman Mom

Buzz Aldrin

Former Fighter Pilot & 2nd Man to Walk on the Moon; Author