Og Mandino (1923 - 1996) was a "sales guru" and author of the bestselling book The Greatest Salesman in the World. His works, based on fundamental Christian beliefs, were also heavily influenced by the likes of Napoleon Hill. Mandino remains one of the most inspirational best-selling authors today. His books have sold over 50 million copies and have been translated into over twenty-five different languages. He was the president of the magazine Success Unlimited until 1976 and has been inducted into the National Speakers Association Hall Of Fame.