Lena Dunham

Writer, Director, Actor & Producer Best Known for HBO’s “Girls”

Jessica Seinfeld

Founder & President of GOOD+ Foundation; Author of Four New York Times Bestselling Cookbooks

Erin Andrews

Fox Sports Correspondent & Former Co-Host of "Dancing with the Stars"

Tim Tebow

ESPN College Football Analyst; Heisman Trophy Winner; Former Quarterback for NFL's Denver Broncos & Baseball Outfielder for the New York Mets

Cesar Millan

Host of The Dog Whisperer; Author of Cesar's Way

Alice Walker

Pulitzer Prize & National Book Award-Winning Author; Best Known for "The Color Purple"

John Green

New York Times Bestselling Author, Known for "The Fault in Our Stars," "Looking for Alaska" & "Paper Towns"

Edie Weiner

President & CEO of The Future Hunters

Caterina Fake

Co-Founder of Flickr & Former Chairman of Etsy

David Suzuki

Environmentalist & Scientist; Co-Founder of the David Suzuki Foundation

Drew Houston

Co-Founder & CEO of Dropbox

Rachel Dratch

Comedian, Actress, and Former SNL Cast Member

Jason Reitman

Academy Award-Nominated Director, Screenwriter & Producer; Best Known for His Work on "Juno" and "Thank You For Smoking"

Mandy Patinkin

Actor Best Known for "Homeland," "Criminal Minds" and "The Princess Bride"

Sandra Lee

Emmy Award-Winning Television Chef & Lifestyle Expert; Breast Cancer Survivor & Activist

Debbie Sterling

Tech Engineer & Founder and CEO of GoldieBlox; Advocate for Women in STEM

Debbie Sterling: Disrupting the Pink Aisle [Entire Talk]

Craig Newmark

Founder of Craigslist; Internet Entrepreneur; Leader in Social Networks

Carnie Wilson

Singer & Actress, Founding Member of "Wilson Phillips"

Tamron Hall

Award-Winning Journalist; Former National News Anchor for NBC News; Host of Tamron Hall Show

John Smoltz

Former Atlanta Braves Pitcher; National Baseball Hall of Famer, World Series Champion & 8-Time MLB All-Star