My research broadly focuses on interstellar gas in the Milky Way and nearby galaxies.

My main research interest is in how our Galaxy gets the gas it needs to form stars. Stars in our Galaxy are continually being formed out of gas, dying, and dispersing heavier elements (say, iron) back into the interstellar gas. By examining the fraction of these heavier metals in stars researchers have found that our Galaxy must be getting replenished by fresh gas over time. I am looking for this expected accretion process in high-velocity clouds, the cooling of a possible massive baryonic halo around our Galaxy, gaseous dwarf satellites orbiting the Galaxy and the interface between the thin, cold disk of our Galaxy and the halo.

I am also interested in the structure of the diffuse interstellar medium and its relationship to accretion, star formation and Galactic evolution. I work on nearby, cold gas clouds and other neutral features in the high Galactic latitude sky.

Part of the all-sky HI survey of the Galaxy, LAB.