John D. Rockefeller, the iconic American entrepreneur and co-founder of Standard Oil, bequeathed not only a fortune but also gems of wisdom in the form of letters to his son, John D. Rockefeller ...

CNBC began raising questions last month about the authenticity of "The 38 Letters from J.D. Rockefeller to his son: Perspective, Ideology and Wisdom," a purported collection of letters by John D.