The Economist story about DESI results (PDF here) (Jun 22, 2024)
DESI BAO Y1 results are out!
(UM press release, LBL press release, X/Twitter, Quanta Mag) (April 4, 2024)

LSA Magazine story about our recent (non-DESI) work (May 2024)
Quanta Magazine article about Hubble tension (Jan 2024)
  My cosmology textbook is out
(late March 2023 in the UK, May 2023 in the U.S.); instructor resources info; errata

Youtube video of Saturday Morning Physics talk, "The Universe Caught Speeding".

Research Group:

(click to enlarge)




I am a theoretical cosmologist, and work as a professor of Physics at the University of Michigan. I also currently serve as the Associate Chair for the Physics Graduate Program at UM. I am a member of two large collaborations, Dark Energy Survey (DES, on which I co-led the Theory and Combined Probes working group in 2018-21), and Dark Energy Spectroscopic Instrument (DESI), where I currently co-lead the Key Project in charge of producing cosmological results from the first year of data from the survey. For more detail, see the "About Me" tag on the top right.