Arjun Dey, Ph.D., Astronomer NSF National Optical-Infrared Astronomy Research Laboratory (NOIRLab) J.S. Guggenheim Fellow, 2021; member, Dark Energy Spectroscopic Instrument (DESI) project. Arjun Dey’s research focuses on how galaxies form and evolve, and what they can tell us about the mysterious, invisible contents of the universe: dark matter and dark energy. One of his early projects uncovered the first galaxy observed at a redshift greater than 5 (i.e., with a light travel time of more than 12.5 billion years). He is a core member of the Dark Energy Spectroscropic Instrument (DESI) survey project, the largest cosmic cartography project ever undertaken.