The Master Key System is a personal development book that was originally published as a correspondence course in 1912. Along with "The Science of Getting Rich", by Wallace D. Wattles, the Master Key System is the source of Rhonda Byrne's inspiration for the book and the film "The Secret".

About the Author

Charles F. Haanel (1866-1949) used the concepts and methods found in

The Master Key System to create a successful business career in St. Louis,

Missouri, where he eventually founded one of the largest conglomerates of his

time. He wrote several bestselling books focusing on his business technique.

Besides The Master Key System, he also wrote Mental Chemistry and

The New Psychology. Known as the "father of personal development,"

Haanel's commonsense wisdom has revolutionized conventional thought for almost

one hundred years.

"About this title" may belong to another edition of this title.

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