The gas between the galaxies, the residue of galaxy formation, the bulk of normal matter in the universe - it's the IGM. My work is focused on understanding the distribution and evolution of the intergalactic material, using both theoretical and observational tools.
Recently (with Don York) I've been awarded some HST time to begin a large survey of IGM physical conditions and metallicity in relation to galaxies from the SDSS.
With FUSE, we are exploring O VI absorbers in low-z SDSS galaxy groups.
Previously, I worked in the Boulder IGM group with Mike Shull and John Stocke. This work was centered on exploring the low-redshift Lyman alpha forest with HST and FUSE.
Many unsolved problems in the IGM could be addressed by a 10 meter or larger telescope in space (a VLST). My favorite project is dicussed in this talk (MS powerpoint), delivered to the VLST Workshop at STScI on February 26, 2004.