emeritus professor of geography at University of Colorado, Boulder, Colorado

Chancellor's Professor of Demography, University of California, Berkeley

CUNY School of Public Health & CUNY Institute for Demographic Research

Professor, Department of Population Science and Human Resource Development, Rajshahi …

Associate Professor, Fudan University

Department of Statistics, Banaras Hindu University, Varanasi

Professor (Full) of Applied Mathematics, University of Zimbabwe

Professor of Statistics, Utkal University

Associate Professor, Laurentian University, Canada

Postdoctorate Durham University