My thesis work is focused on understanding the magnetic properties of the interstellar medium (ISM) within our Galaxy. In particular, I am interested in understanding how the Galactic magnetic field connects between different phases and spatial scales within the ISM. I am also interested in interstellar extinction in star forming regions where the ISM is primarily molecular. To do this, I am using optical and infrared photometry to study stellar extinction curves within a nearby giant molecular cloud with the goal of more accurately characterizing the ISM dust properties.
I am primarily interested in cosmology and galaxy formation and evolution using both observational and theoretical approaches. Recently I was one of the leaders of the Supernova Legacy Survey which found that the dark energy was constant in time to a precision of better than 10%, consistent with Einstein’s cosmological constant. I am also interested in star streams as indicators of the dark matter substructure of the Milky Way halo. I has been the Canadian Thirty Meter Telescope Project Director since 2003.