Augustine "Og" Mandino II (1923-1996) was an American author renowned for his motivational and self-help books, with "The Greatest Salesman in the World" being his most famous work. His writings have achieved global reach, selling over 50 million copies and being translated into more than 25 languages. Mandino's career path was unconventional; after serving as a bombardier in the U.S. Army Air Corps during World War II, he struggled with alcoholism and contemplated suicide. His life took a turn after discovering self-help books in a library, an experience that inspired him to overcome his challenges and dedicate himself to the study and promotion of success principles.

He eventually found employment with W. Clement Stone's Success Unlimited magazine, rising to Executive Editor. Mandino's philosophy centered on the idea that each individual is a unique miracle and possesses the power to consciously direct their life towards their desired outcomes. His works, influenced by religious texts and thinkers like Napoleon Hill and W. Clement Stone, encouraged readers to embrace positive mental attitudes and take deliberate action to achieve abundance and success. Mandino was also recognized for his contributions to public speaking, being inducted into the National Speakers Association's Hall of Fame.

Born in Natick, Massachusetts, in 1923, Og Mandino's early life included editing his high school newspaper and serving as a bombardier in the Army Air Corps during World War II, flying missions over Germany. Following his military service, Mandino faced significant personal struggles, including alcoholism and thoughts of ending his life. A pivotal moment occurred when he found solace and inspiration in self-help and success literature during visits to various libraries across the United States. This immersion in motivational texts helped him combat his alcoholism and set him on a new path.

Mandino's encounter with W. Clement Stone's "Success Through a Positive Mental Attitude" profoundly impacted him, leading him to pursue a career in sales with Stone's company. He quickly excelled, becoming a sales manager and setting records. His talent for writing emerged through promotional materials, eventually leading him to W. Clement Stone's "Success Unlimited" magazine, where he became Executive Editor. Mandino's writings, including his seminal work "The Greatest Salesman in the World," drew inspiration from the Bible and philosophical figures, promoting a core belief that every person is a miracle capable of consciously charting their own course to success and abundance.

The central tenet of Og Mandino's philosophy is the inherent miracle of each individual and the power of conscious choice in directing one's life. He emphasized that successful individuals actively "chart" their journey, deliberately selecting both their goals and the methods to achieve them. This message of personal agency and positive affirmation resonated widely, contributing to the immense popularity of his books. His significant impact on motivational speaking was further acknowledged with his induction into the National Speakers Association's Hall of Fame.