Jocko Willink is an American retired officer of the United States Navy, who served in the Navy SEAL teams.
Tim Ferriss is an American entrepreneur, author and podcaster.
Ryan Holiday is an American author, marketer, entrepreneur and founder of the creative advisory firm Brass Check.
Warren Buffett is the chairman and CEO of Berkshire Hathaway.
Richard Branson is a British business magnate, investor, author and philanthropist.