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"

Caterina Fake

Co-Founder of Flickr & Former Chairman of Etsy

David Suzuki

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

Mandy Patinkin

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

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"

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"

John Smoltz

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

Tamron Hall

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

Sergio Zyman

Marketing Visionary; Former Coca-Cola Marketer

Nicholas Sparks

International Bestselling Novelist & Screenwriter, Known for "The Notebook"