24. Dale Carnegie
In the early 21st century a survey conducted by the Library of Congress ranked How to Win Friends and Influence People, published in 1936 by Dale Carnegie, as the seventh most influential book in American history. Carnegie published several others, and became the leader of what evolved into the self-help industry. His work influenced sales people, business executives, political aspirants, teachers, and many other categories and professions and continues to be cited by leading men and women in all walks of life as both inspiring and practical. More than 80 years after its publication, How to Win Friends and Influence People remains influential among leaders regardless of their fields.