David Glass took over as Walmart’s CEO in 1988 and grew the company’s sales from $16 billion a year to $165 billion in 2000. “We think David Glass may be the most under-appreciated CEO in the history of business,” said Doug McMillon, Walmart’s current president and CEO. “The choices he made and the results of the company reflect his wisdom, dedication and servant leadership. We will miss him immensely and are eternally grateful.”