I am a professor in the physics department at Duke University studying particle physics and cosmology. I try to understand both the nature of the ghostly particles called neutrinos in giant detectors deep underground, and why the expansion of the universe is accelerating using telescopes on top of mountains. I am a member of the Super Kamiokande collaboration where I study neutrino oscillations and proton decay, and I also work on the Large Synoptic Survey Telescope (LSST) studying the nature of Dark Energy.