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
Paper with 4-sigma evidence for departure from LCDM
(PRL Editor's Suggestion, UM press release, SciAm article; Sep 2023)

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

Research Group:

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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.