Dale Carnegie (1888-1955) was an American writer and teacher whose courses in public speaking, salesmanship, corporate training and interpersonal skills effectively drew the blueprint for the modern self-improvement industry. He came from nothing – born into poverty on a Missouri farm – and made his name teaching ordinary people the skills that schools and offices never taught them.
His reputation rests on How to Win Friends and Influence People (1936), a bestseller that has simply never gone out of fashion, followed by How to Stop Worrying and Start Living (1948) and earlier work including Lincoln the Unknown (1932). At the core of his books sits one disarmingly simple idea: you change other people’s behaviour by first changing your own towards them. Nearly a century of imitators has not improved on it much.