Hi, I'm Julian. Welcome to my page!

I am a theoretical cosmologist, joining the UT Austin Department of Astronomy as Assistant Professor in 2023. I'm currently working as a Clay fellow at the Harvard-Smithsonian Center for Astrophysics. Before that I was a postdoctoral fellow at the Harvard Physics Department, and I got my PhD from Johns Hopkins University in 2017, under the supervision of Marc Kamionkowski.  

My work is at the intersection of particle physics and astrophysics. Recently, I have focused on learning about cosmology, galaxy formation, and dark-matter microphysics from the first galaxies. This includes using UV LFs from Hubble+JWST as well as the 21-cm line of hydrogen, where I'm part of the HERA experiment. I have developed tools to use 21-cm both as a new dark-matter probe and as a standard ruler (using velocity-induced acoustic oscillations, or VAOs). My interests also include gravitational lensing, the large-scale structure, light relics, primordial black holes, fast radio bursts, and the cosmic microwave background.

If you're a prospective graduate student or postdoc feel free to reach out to the email below (also see the TCCAP postdoc ad).

You can find my full CV here, and my publications in



Feel free to contact me at

julianmunoz (AT) cfa.harvard.edu