Dale Carnegie was a writer and lecturer. He is widely recognised as the author of several self-help books based on his lectures. He specialised in courses on self-improvement, public speaking, the art of salesmanship, and developing interpersonal relationships.
His most famous book, ‘How To Win Friends And Influence People’, has sold millions of copies around the world and has been translated into multiple languages. Other titles, like ‘How To Stop Worrying And Start Living’, ‘The Quick And Easy Way To Effective Speaking’, and others have also sold very well.
His ideas were considered revolutionary at the time, and are still considered very good advice. The novelty lay in the fact that instead of teaching you how to use mind tricks to get what you want, he advised changing your behaviour to make people more amenable to your point of view.