Alexander Ji

Senior Member, KICP
Assistant Professor, Department of Astronomy and Astrophysics


Ph. D., Massachusetts Institute of Technology, 2017


I am a near-field cosmologist. I study nearby stars and galaxies to understand the first stars and galaxies, the origin of the elements, the history of our galaxy, and the nature of dark matter. I am especially interested in the first stars and galaxies, which formed in the first billion years of our universe. This early epoch is one of the last unexplored frontiers in the history of our universe.

My research interests can broadly be divided into four questions: What were the first stars like? What were the first galaxies like? Where are the relics of these systems in the Milky Way today? And how can we use these to learn about dark matter? I aim to answer these questions with a mix of observations (especially stellar spectroscopy) and theoretical models and simulations.