Brookings Institution

Nonresident Fellow - Economic Studies, USC-Brookings Schaeffer Initiative for Health Policy at Brookings Institution

Brookings Institution

Nonresident Senior Fellow - Foreign Policy, Center for 21st Century Security and Intelligence, Center on the United States and Europe, Arms Control and Non-Proliferation Initiative at Brookings Institution

Emeritus Professor of International Law at Western Sydney University

Villanova University

Adjunct Professor at Villanova University

Villanova University

Research Fellow at Villanova University

Imperial College London

Professor of Infectious Disease Dynamics at Imperial College London

DePaul University

Adjunct Professor at DePaul University

DePaul University

Adjunct Professor at DePaul University

Harris School of Public Policy

Steans Professor in Educational Policy at Harris School of Public Policy

Harvard Medical School

Associate Clinical Professor of Ambulatory Care and Prevention / Lecturer in Population Medicine at Harvard Medical School