The practice of mastermind groups has been around for centuries. It was most recently popularized by author Napoleon Hill in the 1920’s and 1930’s in his books, The Law of Success and Think and Grow Rich, which is often ranked among the most popular business + self-help books ever, with 15+ million copies sold. Through his research, he purportedly interviewed over 500 self-made millionaires (were there that many 100 years ago?) to learn about their secrets to success. In this process, he learned that many of them — including Henry Ford, Thomas Edison, Alexander Graham Bell, Theodore Roosevelt, John Rockefeller, and Charles Schwab — relied on masterminds as a key to their personal growth and business success. If it worked for them, then my hope is that it can also help Entrepreneurs for Impact solve big problems in energy and the environment, while maybe even becoming household names to hungry entrepreneurs 100 years from now.