The Master Key System Audio Podcast - Version 5.3.4.2 The Master Key System - Charles F Haanel is a personal self development course that was published in 1912, when he was 46 years old. Charles F Haanel has been heralded as the God Father of personal development with his self development course - The Master Key System. It is written in the form of a course in New Thought, mental development, financial success, and personal health. Among the key points of Haanel's system are what he refers to as the laws of concentration, attraction, and harmonious thinking and action. Unique to the Master Key System is a set of exercises that accompany each chapter, and which are systematically building upon each other - they are what makes the Master Key System a system. In addition to the Master Key System, Haanel wrote several other books including Mental Chemistry published in 1922, The New Psychology published in 1924, A Book about You published in 1927, and The Amazing Secrets of the Yogi published in 1937. In 1919, Napoleon Hill wrote Haanel a letter thanking him for The Master Key System. In the letter Hill stated, "My present success and the