I am a scientist at the CfA with a primary interest in developing instrumentation for large ground-based telescopes. At the moment my primary role is working on the Giant Magellan Telescope. I am leading the design and construction of the Active Optics system, the part of the GMT that keeps the telescope's giant mirror segments aligned with each other and delivering crisp images to the scientific instruments. Previously I led the development of Megacam, a giant digital imager that is used on the Magellan Clay Telescope at Las Campanas Observatory in Chile, and of MMIRS, an infrared spectrometer used on the MMT Telescope on Mt. Hopkins, Arizona.