Oliver Napoleon Hill was an American self-help author. 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 works insisted that fervid expectations are essential to improving one's life. Most of his books were promoted as expounding principles to achieve "success".

Self-help or self-improvement is a self-directed improvement of oneself—economically, physically, intellectually, or emotionally—often with a substantial psychological basis.