Norman Foster Ramsey, Jr. (born August 27, 1915, in Washington, DC) is an American physicist. A physics professor at Harvard University since 1947, Ramsey also held several posts with such government and international agencies as NATO and the United States Atomic Energy Commission. He was awarded the 1989 Nobel Prize in Physics for the invention of the separated oscillatory field method, which had important applications in the construction of atomic clocks. Ramsey shared the prize with Hans G. Dehmelt and Wolfgang Paul.

wikipedia: http://en.wikipedia.org/wiki/Norman_Foster_Ramsey