John Hay 'Jock' Whitney was a prominent American investor, philanthropist, publisher, and U.S. Ambassador to the United Kingdom. Born into the wealthy Whitney family, he used his inheritance to found J.H. Whitney & Co., one of the first venture capital firms, significantly influencing post-war American business. He also served as the publisher of the influential New York Herald Tribune and was a major figure in the thoroughbred horse racing community. His public service culminated in his appointment as ambassador from 1957 to 1961, cementing his legacy as a leading figure in both finance and diplomacy.