The Law of Success (originally The Law of Success in 16 Lessons) is the title of Napoleon Hill's first book set, published initially in 1928 as a multi-volume correspondence course and later more compact formats in recent years. The work was originally commissioned at the request of Andrew Carnegie at the conclusion of a multi-day interview with Hill, and was based upon interviews of over 100 American millionaires across nearly 20 years, including such self-made industrial giants as Henry Ford, JP Morgan, John D. Rockefeller, Alexander Graham Bell, and Thomas Edison.