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Napoleon Hill (October 26, 1883 – November 8, 1970) was an American self-help author and pioneer in personal development and success philosophy. He is best known for his book "Think and Grow Rich” (1937), which is among the best-selling self-help books of all time. Hill's teachings continue to guide people toward unlocking their potential, overcoming challenges, and attaining financial and personal success. With a legacy spanning decades, Napoleon Hill's profound wisdom inspires many to harness the forces of the mind and create lives of abundance and achievement.

Orison Swett Marden (January 16, 1850 – October 24, 1924) was an American author, editor, self-improvement enthusiast and publisher. He wrote a series of books and essays focussing on personal development and spiritual growth. He believed in the power of attitude, enthusiasm and hard work to achieve success and popularity of his works made Marden one of the first best-selling authors in the self-help genre.

Charles F. Haanel (May 22, 1866 - November 27, 1949) was an American author and success coach known for his best-selling books 'The Master Key System’, ‘The Law of Success’ and 'Outwitting the Devil'. He was once called the Napoleon Hill of his time and his books have inspired millions of people to make positive changes in their life and become successful.