Timothy Ferriss is an American entrepreneur, investor, author, podcaster, and lifestyle guru. He gained prominence through his 4-Hour self-help book series, which includes The 4-Hour Work Week, The 4-Hour Body, and The 4-Hour Chef. These books focused on lifestyle optimizations and achieving more with less time and effort. While Ferriss built his reputation on the 4-Hour methodology, he has since reconsidered this approach. Beyond his publishing work, he has become involved in supporting scientific research into psychedelic treatments, reflecting an evolution in his interests and advocacy.