1. Assistant Professor, Dept. of Civil & Coastal Engineering, University of Florida, PO Box 116580, Gainesville, FL 32611-6580.
2. Graduate Research Assistant, Dept. of Civil & Coastal Engineering, University of Florida, PO Box 116580, Gainesville, FL 32611-6580
3. CSIR Fellow, CSIR Division of Mining Technology, Johannesburg, South Africa
4. Professor, Dept. of Civil & Coastal Engineering, University of Florida, PO Box 116580, Gainesville, FL 32611-6580