Oliver Napoleon Hill (October 26, 1883 – November 8, 1970) was an American self-help author known for his influential book Think and Grow Rich (1937), which has remained among the best-selling self-help books of all time. Hill's work emphasized that fervent expectations are essential to enhancing one's life. Most of his publications were marketed as revealing principles to achieve "success". Despite his celebrated status, Hill is a controversial figure, accused of fraud and his claims, such as meeting Andrew Carnegie and being an attorney, are widely disputed by modern historians.