George Kennan

 He seems to be a diplomat who was sometimes correct and sometimes influential. He also had strange opinions “ Acheson was so offended by a report Kennan wrote in March 1950 in which he suggested that miscegenation between Europeans, Indians and African slaves was the root cause of Latin America's economic backwardness that he refused to have it distributed to the rest of the State Department.” From the Wikipedia article 

https://en.wikipedia.org/wiki/George_F._Kennan