Dan Savage

Advice Columnist & Host of the "Savage Lovecast" Podcast; LGBTQ Activist

Daniel Altman

Sports Analytics & Strategy Expert

Danielle Bradbery

Country Singer; Season 4 Winner of NBC's "The Voice"

Danny Cahill

The BIGGEST "The Biggest Loser." Lost 236 pounds in less than 7 months!

Daryl Hannah

Actress, Best Known for "Kill Bill" & "Splash"; Environmental Activist

Dave Canterbury

Wilderness Survival Teacher, NYT Best-Selling Author of "Bushcraft 101" & Global Ambassador for Morakniv

Dave Franco

Actor and Brother of James Franco; "Now You See Me" and "21 Jump Street"

Dave Gilboa

Co-Founder & Co-CEO of Warby Parker

David Cook

Peak Performance Coach & Author

David Cutler

Harvard Professor of Applied Economics & Author

David Leonhardt

Senior Writer for The New York Times

Ours Was the Shining Future: The Story of the American Dream

David M. Rubenstein

Co-Founder & Co-CEO of The Carlyle Group

David MacAulay

David Macaulay gets under the skins of skyscrapers, mosques, pyramids, subways, and a host of other ancient and modern marvels. His lavish and micro-detailed renderings expose the world's secret engineering to dazzled readers of all ages.

David Meerman Scott

Global Marketing Guru & Sales Expert

David Merritt

Former Chairman of the Center for Health Transformation and Expert on Healthcare Policy

David Satcher, M.D., Ph.D.

16th US Surgeon General; Founding Director of the Satcher Health Leadership

David Wolman

Author of "The End of Money" and Wired Contributing Editor

Debora Spar

NYT Bestselling Author & Senior Associate Dean of Business & Global Society, Harvard Business School

Deborah Norville

Two-Time Emmy Award-Winning Journalist; Anchor of "Inside Edition" & Best-Selling Author

Dennis Snow

Customer Service Expert, Formerly with the Disney Institute, Business Author

Derald Wing Sue

Professor & Author

Derek Daly

International Racing Champion, Bestselling Author, CEO & Founder of MotorVation

Devin Alexander

New York Times Bestselling Author, Celebrity Chef Known For "Biggest Loser"

Devon Harris

Member of First Jamaican Bobsled Team; Featured in Hit Disney Movie, "Cool Runnings"

Dia Frampton

Runner-Up on Season 1 of "The Voice"

Doc Hendley

Global Humanitarian, Clean Water Crusader, Top 10 CNN Hero, Sustainability Advocate

Don Peppers

Marketing & Sales Futurist, Customer Experience Thought Leader, Best-Selling Author

Don Yaeger

Award-Winning Leadership Coach & Best-Selling Author

Doug Lansky

Award-Winning Travel Writer, World-Travel Expert & Travel Trends Futurist

Douglas Merrill

Co-Founder and CEO of ZestFinance.com; Google's Former Chief Information Officer