In his early Army career, he excelled in staff assignments, serving under Generals John J. Pershing, Douglas MacArthur, and Walter Krueger. After Pearl Harbor, General George C. Marshall called him to Washington for a war plans assignment. He commanded the Allied Forces landing in North Africa in November 1942; on D-Day, 1944, he was Supreme Commander of the troops invading France. After the war, he became President of Columbia University, then took leave to assume supreme command over the new NATO forces being assembled in 1951. Republican emissaries to his headquarters near Paris persuaded him to run for President in 1952.