R H JRoy Herbert Jarrett (1874-1937) was a Chicago sales executive and advertising man. After many years of studying metaphysical success methods, Jarrett produced the landmark pamphlet It Works in 1926. It has since sold more than a millioncopies. In 1931 Jarrett followed up his mind-power classic with his second and final book, The Meaning of the Mark, which served as the "inner key" to his earlier volume. Read More Read Less