Dale Breckenridge Carnegie (originally Carnagey until 1922 and possibly somewhat later) (November 24, 1888 ??? November 1, 1955) was an American writer and lecturer and the developer of famous courses in self-improvement, salesmanship, corporate training, 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, a massive bestseller that remains popular today. He also wrote a biography of Abraham Lincoln, titled Lincoln the Unknown, as well as several other books.

Carnegie was an early proponent of what is now called responsibility assumption, although this only appears minutely in his written work.[citation needed] 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.

How to Win Friends and Influence People is the first, and still the finest, book of its kind. One of the best-known motivational books in history, Dale Carnegie's groundbreaking work has sold millions of copies, has been translated into almost every known written language, and has helped countless people succeed in both their business and personal lives. First published in 1937, Carnegie's advice has remained relevant for generations because he addresses timeless questions about the fine art of getting along with people: How can you make people like you instantly? How can you persuade people to agree with you? How can you speak frankly to people without giving offense? The ability to read others and successfully navigate any social situation is critically important to those who want to get a job, keep a job, or simply expand their social network. The core principles of this book, originally written as a practical, working handbook on human relations, are proven effective. Carnegie explains the fundamentals of handling people with a positive approach; how to make people like you and want to help you; how to win people to your way of thinking without conflict; and how to be the kind of leader who inspires quality work, increased productivity, and high morale. As Carnegie explains, the majority of our success in life depends on our ability to communicate and manage personal relationships effectively, whether at home or at work. How to Win Friends and Influence People will help you discover and develop the people skills you need to live well and prosper.