Professor of Astronomy & Astrophysics, Penn State University

Professor of Astronomy, Boston University

University of St Andrews

Australian National University

Senior Astrophysicist, Center for Astrophysics | Harvard & Smithsonian

Professor of Astrophysics, Department of Physics and Astronomy, University of Florence

Washington University in Saint Louis, Dept. of Physics

The Chinese University of Hong Kong

Aalto University

Washington University in Saint Louis