Professor, Department of Physics and Astronomy, University of British Columbia, July 2013-
Associate Professor, Department of Physics and Astronomy, University of British Columbia, July 2008-June 2013
Assistant Professor, Department of Physics and Astronomy, University of British Columbia, July 2003-June 2008
Chandra Fellow, Theoretical Astrophysics Division, Harvard-Smithsonian Center for Astrophysics, September 2000-July 2003
Lee A. DuBridge Postdoctoral Fellow in Theoretical Astrophysics, California Institute of Technology, January 1998-August 2000
Visiting Researcher, The Central Astronomical Observatory at Pulkovo, Saint Petersburg, Russia, June 1992-September 1992
Research Assistant, National Astronomical and Ionospheric Center, Arecibo, Puerto Rico, June 1991-August 1991
Research Assistant, Princeton University Observatory, Princeton, New Jersey, June 1989-September 1989
Canada Research Chair, Chandra Fellow, NSF Graduate Fellow, Marshall Scholar, Goldwater Scholar, Watson Scholar
CASCA LRP2020 Committee, JCSA Committee, Principal Investigator Colibrì Mission, X-Calibur Science Tearm, IXPE Science Team, eXTP Science Team, TMT ISDT (Fundamental Physics and Stars), Associate Member VERITAS Collaboration