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Philip Choi's research spans a range of astrophysical topics, including the study of star formation in young stellar clusters, the modeling and investigation of galaxy interactions in the nearby universe, the star formation and AGN activity of distant galaxies in the early universe and the development of astronomical adaptive optics instrumentation that enables ultra-high-resolution ground-based imaging.

For the investigation of distant galaxies, he has combined deep, infrared Spitzer Space Telescope observations with Keck ground-based spectroscopy to study the evolution of infrared luminous galaxies in the early universe. In particular he is interested in tracking active galactic nucleus activity, star formation, and the galaxy interaction history of this population over cosmic timescales.

While at Pomona, he has led a team of undergraduate student researchers in an intensive effort to develop and deploy a low-cost, remote-access, natural guide-star adaptive optics system for the one-meter telescope at the �鶹��ý Table Mountain Observatory. The system offers simultaneous dual-band, diffraction-limited imaging at visible and near-infrared wavelengths and delivers an order of magnitude improvement in point source sensitivity and angular resolution relative to the current seeing limit.