Barack Obama is an American attorney and politician who served as the 44th president of the United States.
Bill Gates is an American business magnate, software developer, investor, and philanthropist.
Tim Ferriss is an American entrepreneur, author and podcaster.
Noam Chomsky is an American linguist, philosopher, cognitive scientist, historian, social critic, and political activist.
Elon Musk is an engineer and technology entrepreneur.
Stanislav Grof is a Czech psychiatrist.