The most successful leaders all have one thing in common: They've read How to Win Friends and Influence People. As a salesman, Dale Carnegie made his sales territory the national leader for the firm he worked for. Carnegie eventually ended his sales career and taught public speaking to share his success. Even Warren Buffet, one of the most successful investors of the 20th century, took Carnegie's course at age 20. Fortunately for us, all the same lessons are packaged into the now-famous book. "The rare individual who unselfishly tries to serve others has an enormous advantage". Dale Carnegie.