Professor Emeritus, University of CA, Berkeley, Dept. of Earth and Planetary Science

Professor of Geology, Roma Tre University

Professor of Geology, University of Johannesburg

Tohoku University

Istanbul Technical University, Dept. of Geological Eng.

Dept. Earth Sciences, University of Torino, Italy

McGill University

Professor, Stellenbosch University

Missouri University of Science and Technology

Department of Geology, Cumhuriyet University, Sivas TURKEY