- B.S., City College of New York
- Ph.D., Columbia University
- Docteur honoris causa, Sorbonne, Universities of Paris-IPGP
Paleomagnetism, geomagnetism, and rock magnetism, and their application to geologic problems. Current interests include astrochronostratigraphic polarity time scales, paleogeography, paleoclimatology, true polar wander and the long-term carbon cycle and early hominin dispersal.
European Geosciences Union. Fellow of the Geological Society of America, American Geophysical Union, American Association for the Advancement of Science, American Academy of Arts & Sciences. Member of the U.S. National Academy of Sciences.