Who was Dale Carnegie?

The following is excerpted from the 1983 World Book Encylopedia

CARNEGIE, DALE (1888-1955), was a pioneer in public speaking and personality development. He became famous by showing others how to become successful. His book "How to Win Friends and Influence People" (1936) has sold more than 10 million copies and has been translated into many languages. His books became popular because of his illustrative stories and simple, well-phrased rules. Two of his most famous maxims are, "Believe that you will succeed, and you will," and "Learn to love, respect and enjoy other people." His other books include "How to Stop Worrying and Start Living" (1948). Toward the beginning of his career, Carnegie wrote "Public Speaking and Influencing Men in Business" (1931), which became a standard text.