My primary research interests are in extragalactic astrophysics and X-ray astronomy. Current projects focus primarily on the environments, active nuclei, and jets of radio galaxies, and the multi-wavelength emission of all classes of radio-loud AGN. My publication list is available via a search on the NASA Astrophysics Data System (https://ui.adsabs.harvard.edu/).

I'm a scientific editor of MNRAS,  and was President of Division D (High Energy Phenomena and Fundamental Physics) of the International Astronomical Union from 2012 to 2015.

Earlier years were spent as a research scientist in the United States, at the Laboratory for High Energy Astrophysics at NASA/GSFC, at the Center for Astrophysics and Space Sciences at UC-San Diego, and at the Harvard-Smithsonian Center for Astrophysics (CfA). I helped to establish the Chandra X-ray Center where I was a scientist for several years.