Though I greatly enjoy branching into new areas when the opportunity arises, my main field is microwave spectroscopy of interstellar molecular clouds. I study primarily the very largest clouds in galaxies, which form the most massive stars. These stars live furiously, greatly affecting their surroundings with their winds and radiation, then die dramatically in giant explosions that enrich the interstellar medium in heavy elements. Their lives are relatively brief as well (only 10 million years or less) so their impact is not only profound but immediate. Certain galaxies known as starbursts create numerous clusters of these massive stars in their centers. I study the gas that forms these stars in starbursts and in our own, normal, Milky Way Galaxy. I have also studied gamma-ray emission from galaxies, and the clustering of starbursts from the early Universe to today. I look forward to observing variable stars with the York College Observatory, and the cosmic microwave background radiation from the Big Bang through the recently funded Center for Cosmic Structure.