Og Mandino was an American author and motivational speaker best known for his bestselling classic The Greatest Salesman in the World. Rising from a difficult past marked by personal struggles, he transformed his life through self-discipline and positive philosophy. His books emphasize perseverance, optimism, and the power of daily habits, inspiring millions worldwide to pursue success and personal fulfillment. Mandino’s legacy lies in blending timeless wisdom with accessible storytelling to guide people toward a more purposeful life.