Dr. Romanowsky has worked on a variety of astrophysical topics, including dark matter, supermassive black holes, gravitational lensing, the expansion of the universe, modified general relativity, star clusters, planetary nebulae, X-ray emitting hot gas, and galaxy interactions. His research makes use of cutting-edge facilities including the Keck Observatory, the Hubble Space Telescope, and NASA supercomputers. His current emphasis is on the origins of galaxies revealed through their dynamics -- using a combination of observations, theory, and simulations.