Professor of Astronomy & Astrophysics, Penn State University

University of St Andrews

Professor of Astronomy, Boston University

Australian National University

Senior Astrophysicist, Center for Astrophysics | Harvard & Smithsonian

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

The Chinese University of Hong Kong

Washington University in Saint Louis, Dept. of Physics

Washington University in Saint Louis

Scientist, Space Telescope Science Institute