Reid W. Barton
Barton was the first student to win four gold medals at the
International Mathematical Olympiad,[1] culminating in full marks
at the 2001 Olympiad held in Washington, D.C., shared with Gabriel
Carroll, Xiao Liang and Zhang Zhiqiang.[4]
Barton has won the Morgan Prize awarded jointly by the American
Mathematical Society and the Mathematical Association of America for
his work on packing densities.[9]
http://en.wikipedia.org/wiki/Reid_W._Barton Noam Elkies
In 1981, at age 14, Elkies was awarded a gold medal at the 22nd
International Mathematical Olympiad, receiving a perfect score of
42 and becoming one of just 26 participants to attain this score.[1]
the youngest ever to do so. Elkies graduated from Stuyvesant High
School in 1982[2] and went on to Columbia University, where he won
the Putnam competition at the age of sixteen years and four months,
making him one of the youngest Putnam Fellows in history.
In 1993, he was made a full, tenured professor at the age of 26.
This made him the youngest full professor in the history of Harvard,
surpassing previous then-youngest professors Alan Dershowitz,
William H. Press, and Lawrence Summers (who were each made full
professors at age 28).
http://en.wikipedia.org/wiki/Noam_Elkies 
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