Dale Carnegie was a lecturer of public speaking at YMCA New York. He had also served U.S. army during World War 1. He started his career by giving lectures on personality development and public speaking. He became a sought after teacher and later, writer later on in his life. He published his first book in 1936 and authored more self-help books renowned around the world. Some of his other works include 'How to Stop Worrying and Start Living’ and 'Lincoln the Unknown’
