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Dr. Ernest Kessler, Jr.

Research Interests

Precision optical, x-ray, and gamma-ray measurements. Nearly perfect crystal lattice spacing measurements. Measurements related to the determination of fundamental constants.

Awards and Honors

  • Department of Commerce Gold Medal – 1997
  • Department of Commerce Silver Medal – 1978
  • NASA Traineeship – University of Wisconsin
  • Wisconsin Alumni Research Foundation Fellowship


NIST Associate
Structure Determination  Methods Group

Employment History:

2004-present: Contract and W2 Hourly Employee, KT Consulting, Inc., Antioch, CA. and NIST. Performed precision crystal lattice measurements at NIST, represented NIST to the International Avogadro Coordination Committee, and trained NIST scientists on the use and maintenance of the delta-d spectrometer
1971-2003: Research Physicist, Quantum Metrology and Atomic Physics Divisions, NIST
2001-2003: Group leader, Quantum Metrology Group, NIST
1980-1981, 1983-1984: Acting Chief, Quantum Metrology Division, NIST, during absence of division chief
1969-1971: NRC-NBS Postdoctoral Research Associate, NIST
1986: Teacher Assistant – Introductory Physics, Montgomery College, Rockville, MD


Ph.D. Physics, The University of Wisconsin, Madison, Wisconsin, 1969
M.S. Physics, The University of Wisconsin, Madison, Wisconsin, 1964
B.S. in Education, Shippensburg State College, Shippensburg, Pennsylvania, 1962


Phone: 301-975-4844
Fax: 301-975-5334