“As far as income goes, there are three currencies in the world; most people ignore two. The three currencies are time, income and mobility, in descending order of importance. Most people focus exclusively on income.”

American entrepreneur, investor, author, podcaster

Timothy Ferriss is an American entrepreneur, investor, author, podcaster, and lifestyle guru. He is known for his 4-Hour self-help book series, including The 4-Hour Work Week, The 4-Hour Body, and The 4-Hour Chef. Those books made him widely known for advice on optimizing everyday life, though he has since reconsidered that approach. He has also supported scientific research into psychedelic treatments, extending his public work beyond the self-help genre.