Professor of Astronomy, Cornell University

Professor of Astronomy, California Institute of Technology

Associate Professor of Astronomy & Astrophysics, Penn State University

Professor emeritus of Anthropology, Dalhousie University

Senior Research Fellow, Institute for Molecular Manufacturing

University of California, Berkeley

Jet Propulsion Laboratory

University of California

Senior Research Fellow, Future of Humanity Institute, Oxford University

Ecole Polytechnique Fédérale de Lausanne (EPFL)