John Maynard Keynes
Keynes also attended the Conference on the Versailles Treaty to end World War I. He wrote The Economic Consequences of the Peace in 1919, and A Revision of the Treaty in 1922. In his books he said that the reparations which Germany was being made to pay would ruin the German economy and would lead to further fighting in Europe. These predictions were shown to be true when the German economy suffered in the hyperinflation of 1923. Reparations were only completed in 2010.