All of the following leaders EXCEPT which individual met at Potsdam Germany in the summer of 1945 in order to determine the fate of the Axis Powers?

The leaders who met at the Potsdam Conference in the summer of 1945 included Joseph Stalin, Harry S. Truman, and Winston Churchill (and later Clement Attlee). However, Adolf Hitler did not attend, as he was the leader of the Axis Powers and had already died by suicide in April 1945. Therefore, the individual who did not meet at Potsdam is Adolf Hitler.