University of Denver

Ferris Family Professor Emeritus, Cornell Brooks School of Public Policy, Cornell University

Research Professor, University of Denver

Professor, Sociology and Minnesota Population Center, University of Minnesota

Professor of Sociology, University of Virginia

Professor, School of Family Life, Brigham Young University

Professor of Demography, University of Southampton

Cardinal Stefan Wyszyński University in Warsaw

University of Turin & Collegio Carlo Alberto

Professor of Sociology, University of Indianapolis