Margaret A. Hamburg

Foreign Secretary, National Academy of Medicine; Former Commissioner, US FDA

Aaron Dignan

Founder of The Ready, Business Consultant & Author

Aaron McCargo Jr.

Chef & Star of "Big Daddy's House" on the Food Network

Aarti Sequeira

Award-Winning Producer, Journalist & Food Personality

Dan Abrams

Chief Legal Affairs Anchor at ABC News & Founder of Abrams Media

Jon Acuff

Lead Pastor, Christian Speaker; New York Times Bestselling Author of "Do Over"

Ad Libs

Ad-libs Improvisational Comedy Troupe

Anthony Adams

Former Defensive Tackle for the San Francisco 49ers & Host for ABC's "The Great American Baking Show"

The Great American Baking Show: Holiday Edition

Afterburner

US Fighter Pilots & Team-Building Experts

Ainsley Rose

Author, Consultant, Former Director of Education for the Western Quebec School Board

Al Madrigal

Comedian and Correspondent on "The Daily Show"

Alan Keyes

Former US Ambassador to the UN Social & Economic Council

Alan Page

Retired Minnesota Supreme Court Justice & Former Professional Football Player

Alan Moore

Author, Entrepreneur, Craftsman

Alesha Renee

Actress and TV Personality; Appeared on "Guy Code," "E! News," "HotWyred," "The 5ive," BET and the BET Awards Pre-Show

Tony Alessandra

Premier Communications Expert; Author of "The Platinum Rule;" Chairman of BrainX.com

Alex Newell

Actor & Singer Known for "Glee"

Alex Jones

Internationally Recognized Veteran Broadcaster, Documentary Filmmaker, and Investigative Journalist

Devin Alexander

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

Shaun Alexander

Former NFL Runningback