Dave Asprey is an American entrepreneur, author, and biohacker. He is the founder of the website Bulletproof Executive and the author of several books, including The Bulletproof Diet and The Head Strong. Asprey's books focus on diet, biohacking, and self-improvement. The Bulletproof Diet is a New York Times Bestseller that was released in 2014. The book focuses on Asprey's diet and lifestyle principles that he used to lose 100 pounds without counting calories or following a traditional diet. The Head Strong is a book that was released in 2016. The book focuses on Asprey's biohacking techniques that he used to improve his cognitive performance. Asprey claims that he used these techniques to increase his IQ by 20 points. Asprey's books have been met with mixed reviews. Some critics have praised Asprey's approach to diet and self-improvement, while others have criticized his claims about the efficacy of his biohacking techniques.