I'm a retired faculty member. For many years I worked on radio, millimeter-wave and infrared observations of the interstellar medium in the Milky Way and other galaxies, studying star formation, molecular cloud structure, the cold ISM in elliptical galaxies, mass loss from evolved stars, and galactic structure. Starting about 1990, I worked with Jim Gunn, Robert Lupton, Michael Strauss and many others on the construction of the Sloan Digital Sky Survey, and was involved in the discovery and characterization of field brown dwarfs. Other SDSS projects included the study of magnetic variability in low-mass main sequence stars,
low-metallicity and carbon-rich dwarf stars, and metal-rich white dwarfs. More recently I worked with direct-imaging searches for giant planets around nearby stars using AO on the Subaru telescope, first with the SEEDS survey and more recently with the CHARIS spectrograph. I've also returned to exploring the luminosity of giant carbon stars using astrometric data from Gaia.