Professor, University of Toronto

Professor of Geology, Union College

Professor of Earth Sciences, Syracuse University

Department of Geology, Istanbul University-Cerrahpaşa

Institute of Geology and Geophysics, Chinese Academy of Sciences

Dept. of Earth, Planetary, and Space Sciences, UCLA

NordSIMS, Swedish Museum of Natural History

Wigner Research Centre for Physics

Dr., Central Laboratory, Middle East Technical University

Professor of Geology, Olivet Nazarene University