Dale Carnegie

 

Dale Carnegie (/ˈkɑːrnɪɡi/;^[1] spelled Carnagey until c. 1922; November 24, 1888 – November 1, 1955) was an American writer and lecturer, and the developer of courses in self-improvement, salesmanship, corporate training, public speaking, and interpersonal skills. Born into poverty on a farm in Missouri, he was the author of How to Win Friends and Influence People (1936), a bestseller that remains popular today. He also wrote How to Stop Worrying and Start Living (1948), Lincoln the Unknown (1932), and several other books.^[2]

One of the core ideas in his books is that it is possible to change other people's behavior by changing one's behavior towards them.Wikipedia