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, and several other books.
Carnegie was an early proponent of what is now called responsibility assumption, although this only appears minutely in his written work. 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.
Born in 1888 in Maryville, Missouri, Carnegie was a poor farmer's boy, the second son of James William Carnagey (b. Indiana, February 1852 – living 1910) and wife Amanda Elizabeth Harbison (b. Missouri, February 1858 – living 1910). In his teens, though still having to get up at 4 a.m. every day to milk his parents' cows, he managed to get educated at the State Teacher's College in Warrensburg. His first job after college was selling correspondence courses to ranchers; then he moved on to selling bacon, soap and lard for Armour & Company. He was successful to the point of making his sales territory of South Omaha, Nebraska the national leader for the firm.