George Bush, not to be confused with his son George W. Bush who later became the President.
Dwight D. Eisenhower
President Harry Truman helped create the United Nations.
President Franklin.
The current president of the United Nations General Assembly (as of February 2010) is Ali Abdussalam Treki, from Libya.
Yes, the United Nations has a president who is usually voted by the representatives of UNGA.
Secretary General of the United Nations
Only the Iranian ambassador to the United Nations in New York
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Carol P Romulo was the Fourth President of the United Nations General Assembly, in 1949-50.
Roosevelt
Diosdado Macapagal
Harry S. Truman