Joel Leja

Joel Leja is the Dr. Keiko Miwa Ross Early Career Assistant Professor in the Department of Astronomy and Astrophysics at The Pennsylvania State University, with a co-hire through the Institute for Computational & Data Sciences (ICDS) and the Institute for Gravitation and the Cosmos. His research focuses on galaxy formation and evolution, combining JWST observations with advanced statistical and machine learning techniques. He earned his Ph.D. from Yale University in 2016 and a B.A. in Physics and Astrophysics from UC Berkeley in 2010.

Leja leads the RUBIES and Blue Jay surveys, analyzing JWST data to study high-redshift galaxies, including 'Little Red Dots' and AGN populations. His work integrates computational models like Prospector-α to interpret galaxy photometry and spectra. Notable contributions include resolving discrepancies in cosmic star formation rates and uncovering ancient stellar populations in early galaxies.

• Affiliations: ICDS Faculty Fellow, Institute for Gravitation and the Cosmos member
• Education: Ph.D. Yale University (2016), B.A. UC Berkeley (2010)
• Key Projects: UNCOVER Treasury Survey, JWST deep field analysis, Prospector Bayesian framework

He has been recognized as a Clarivate Highly Cited Researcher (2023) and received the Yale Brouwer Prize (2019). His outreach efforts include reverse science fairs and public lectures, such as the 2024 Ashtekar Frontiers of Science talk on JWST discoveries.