Eisenhower:
On December 24, 1943, after the successful invasion of Sicily in July and Italy in September, he was appointed supreme commander of the Allied Expeditionary Forces. -From Wikipedia, the free encyclopedia.
Marshall:
Marshall authored the document that would become the central strategy for all allied operations in Europe and designed Operation Overlord, the invasion of Normandy. Throughout the remainder of the World War II, Marshall coordinated all allied operations in Europe and the Pacific. He was characterized as the organizer of Allied victory by Winston Churchill. Time Magazine named Marshall Man of the Year in 1944. -From Wikipedia, the free encyclopedia.
I don't think that Eisenhower had much to do with operations in the Pacific.