Geosciences Research Division

Distinguished Professor of Geophysics

Research Interests

  • The behavior of the ancient geomagnetic field: How long has the geomagnetic field been essentially dipolar? Why does the magnetic field reverse? How strong can the magnetic field get? How fast can it change?
  • Statistical analysis of paleomagnetic data.
  • Applications of paleomagnetic data to geological problems such as: The use of paleomagnetic data for geochronological control. The use of paleointensity variations as an additional magnetostratigraphic tool. 
  • Rock fabrics: The use of paleomagnetic data in structural and tectonic problems

Research Keywords

Paleomagnetism; Rock magnetism; Magnetostratigraphy; Paleointensity; Archaeomagnetism; ancient geomagnetic field


  • B.S., Yale University
  • M.A., Columbia University
  • Ph.D., Columbia University

Honors and Awards:

       George P. Woolard Award, Geological Society of America, 2003

       Franklin Medal, Franklin Institute, 2014

       Arthur L. Day Medal, Geological Society of America, 2014.  

       Fellow of:  American Geophysical Union, Geological Society of America, AAAS

       Elected to the National Academy of Sciences, 2015

       Elected to the American Academy of Arts and Sciences, 2016