Dale Carnegie (November 24, 1888 - November 1, 1955) was an American writer and the developer of famous courses in self-improvement, salesmanship, and corporate training programs, public speaking and interpersonal skills. Born in poverty on a farm in Missouri, he was the author of How to Win Friends and Influence People, first published in 1936, which has sold over 15 million copies through many editions and remains popular today. He also wrote a biography of Abraham Lincoln titled Lincoln the Unknown and several other books.
Carnegie was an early proponent of what is now called responsibility assumption. One of the core ideas in his books is that it is possible to change other people's behavior by changing one's reaction to them.
