Professor, Department of Population Health Sciences, Georgia State University

Professor Emerita, Department of Mathematics, University of British Columbia

Professor & Director, Department of Mathematics and Physics, Polytechnic Institute of Tomar (PIT), Portugal

Professor, Department of Mathematics, University of Wisconsin, Whitewater

Professor, Department of Mathematics, University of Texas, Arlington

Professor, Department of Mathematics and Statistics, University of South Florida

Drexel Professor, Department of Mathematics, University of North Carolina

Epidemiologist & Professor, Department of Biological Sciences, University of Notre Dame