Og Mandino, born Augustine Mandino II, was an influential American writer, born on December 12, 1923, in Natick, Massachusetts. He is best known for his bestselling book The Greatest Salesman in the World. His literary works have achieved significant success, with over 50 million copies sold and translations in over 25 languages.

Mandino served as the president of Success Unlimited magazine until 1976 and was honored with an induction into the National Speakers Association's Hall of Fame.