""John D. Rockefeller: A Portrait In Oils"" is a biography of one of the most influential figures in American business history, written by John K. Winkler. The book chronicles the life and career of John D. Rockefeller, from his humble beginnings as the son of a traveling salesman to his rise as the founder of Standard Oil and one of the wealthiest men in history. Through extensive research and interviews with Rockefeller's family, friends, and colleagues,...