Professor Emeritus, Department of Earth and Atmospheric Sciences, College of Arts and Sciences, Indiana University Bloomington
1975 - current
Geologist, International MInerals and Chemcials Corp
Visiting Scientist, National Science Foundation
Program Director, National Science Foundation
Visiting Professor, Swiss Federal Institute of Technology (ETH) Zürich
Visiting Professor, University of Tokyo, Japan
Geologist, Anaconda American Brass
Leverhulm Fellow, University of Leeds
Geologist, United States Geological Survey