Walmart as we know it today evolved from Sam Walton’s goals for great value and great customer service. “Mr. Sam,” as he was known, believed in leadership through service. This belief that true leadership depends on willing service was the principle on which Walmart was built, and drove the decisions the company has made for the past 50 years. So much of Walmart’s history is tied to the story of Sam Walton himself, and so much of our future will be rooted in Mr. Sam’s principles.