Hogg's main research interests are in observational cosmology,
especially approaches that use galaxies (including our own Milky
Way) to infer the physical properties of the Universe. He is also
interested in developing software technology that makes these
projects possible, for his group and for the astrophysics community
as a whole. His research is supported by
New York University,
NASA,
the NSF, and
the Humboldt Foundation.
Hogg is working towards several comprehensive projects in observational astrophysics, including the measurement and simultaneous analysis of every galaxy (above some mass) in the observable Universe, every star (above some brightness) in our Galaxy, or every image (above some quality) taken by any astronomical camera. The comprehensive goals are long-term goals, but he is involved in present-day projects that work towards them, including Astrometry.net, Gaia, NYU-VAGC, and SDSS-III.
For more information consult his research diary, preprints, refereed publications, or CV.