John L. Hall

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John Lewis Hall
Hall at the 2012 Lindau Nobel Laureate Meeting
Born	(1934-08-21) August 21, 1934 (age 89) Denver, Colorado, U.S.
Nationality	American
Alma mater	Carnegie Institute of Technology
Known for	Optical frequency comb
Awards	Department of Commerce Gold Medal (1969) Nobel Prize in Physics (2005)
Scientific career
Fields	Physics
Institutions	University of Colorado Boulder, JILA, NIST
Doctoral students	Jun Ye

John Lewis "Jan" Hall (born August 21, 1934) is an American physicist, and Nobel laureate in physics. He shared the 2005 Nobel Prize in Physics with Theodor W. Hänsch and Roy Glauber for his work in precision spectroscopy.