By virtue of his proximity to the President , Watson was present at some of the defining moments of the Second World War . These included a meeting about the Einstein – Szilard letter , which would eventually lead to the creation of the Manhattan Project , and FDR ’s agreement to the Atlantic Charter alongside British Prime Minister Winston Churchill , providing a framework for those values that would guide the post-war world . He was in constant contact with Generals Dwight D. Eisenhower and Douglas MacArthur and Admiral Nimitz . He attended the Teheran Conference where the first of the negotiations between FDR , Churchill , and Soviet Premier Joseph Stalin took place . Although in poor health , he attended the Yalta Conference in February 1945 as well , where the Big Three negotiated for the future of Europe . On the return voyage , he suffered a fatal cerebral hemorrhage and died at sea
Yalta Conference
Yalta Conference
Edwin "Pa" Watson