Assistant Research Professor & Assistant Astronomer
NSF Astronomy & Astrophysics Postdoctoral Fellow
Postdoctoral Research Associate
University of Arizona (Sept 2020- present)
University of Arizona (Sept 2017- Sept 2020)
University of Arizona (Sept 2014-Sept 2017)


University of Massachusetts, Amherst

University of Alaska, Fairbanks
Johns Hopkins University
Ph.D. Astronomy (2014)
M.S. Astronomy (2010)
M.S. Geophysics (2006)
B.S. Physics (2003)

Invited Talks

Invited Talk, Multi-Object Spectroscopy for Statistical Measures of Galaxy Evolution, Space Telescope Science Inst. Workshop, May 17-20, 2021
Colloquium, New Mexico State University, Mar 19, 2021
Astrophysics Seminar, University of Pittsburgh/Carnegie Mellon, Feb 19, 2021
Colloquium, York University, Feb 2, 2021
Astrophysics Seminar, University of Missouri-Columbia, Sept 29, 2020
Invited Talk, The Growth of Galaxies in the Early Universe, Sesto, Italy, January 19-24, 2020
Invited Talk, The Art Of Measuring Galaxy Physical Properties, Milan, Italy, November 19, 2019
Galaxies & Cosmology Seminar, Harvard/Smithsonian Center for Astrophysics, October 1, 2019
Steward Observatory/NOAO Joint Colloquium, September 19, 2019
Subaru Seminar, Subaru Observatory Headquarters, March 19, 2019
CIERA Seminar, Northwestern University, February 20, 2018
Science Seminar, Las Cumbres Observatory Headquarters, April 27, 2017
Colloquium at UMass-Amherst, March 2, 2017
Yale Center for Astronomy and Astrophysics Seminar, February 28, 2017
Colloquium at Lowell Observatory, October 6, 2016
Invited talk, Lorentz Center Workshop: Deconstructing galaxies at cosmic noon: present and future of deep spectroscopic surveys at high-redshift, Leiden, NL, August 1-5, 2016.
Brown University Astrophysics Seminar Series, Providence, RI, April 16, 2014.


Publications on ADS
Google Scholar listings

  1. Williams et al, 2021. ALMA measures rapidly depleted molecular gas reservoirs in massive quiescent galaxies at z~1.5
  2. Caliendo et al, 2021. Early Science with the Large Millimeter Telescope: Constraining the Gas Fraction of a Compact Quiescent Galaxy at z=1.883
  3. Garilli et al, 2021. The VANDELS ESO public spectroscopic survey: final Data Release of 2087 spectra and spectroscopic measurements
  4. Akhshik et al, 2021. Recent Star-formation in a Massive Slowly-Quenched Lensed Quiescent Galaxy at z=1.88
  5. Akhshik et al, 2020. REQUIEM-2D: Spatially Resolved Stellar Populations from HST 2D Grism Spectroscopy
  6. Behroozi et al, 2020. The Universe at z>10: Predictions for JWST from the UniverseMachine DR1
  7. Kauffmann et al, 2020 Simulating JWST deep extragalactic imaging surveys and physical parameter recovery
  8. Hainline et al, 2020 Simulating JWST/NIRCam Color Selection of High-redshift Galaxies
  9. Endsley et al, 2020 Clustering with JWST: Constraining Galaxy Host Halo Masses, Satellite Quenching Efficiencies, and Merger Rates at z=4-10
  10. Williams et al, 2019 Discovery of a dark, massive, ALMA-only galaxy at z~5-6 in a tiny 3-mm survey
  11. Spilker et al, 2019 Evidence for Inside-Out Galaxy Growth and Quenching of a z~2 Compact Galaxy from High-Resolution Molecular Gas Imaging
  12. Rujopakarn et al, 2019 ALMA 200-parsec Resolution Imaging of Smooth Cold Dusty Disks in Typical z~3 Star-Forming Galaxies
  13. Bezanson et al, 2019 Extremely Low Molecular Gas Content in a Compact, Quiescent Galaxy at z=1.522
  14. Williams et al, 2018 The JWST Extragalactic Mock Catalog: Modeling galaxy populations from the UV through the near-IR over thirteen billion years of cosmic history
  15. Posselt et al, 2018 Discovery of Extended Infrared Emission around the Neutron Star RXJ0806.4-4123
  16. Ji et al, 2018 Evidence of Environmental Quenching at Redshift z~2
  17. Pentericci et al, 2018 The VANDELS ESO public spectroscopic survey: observations and first data release
  18. McLure et al, 2018 The VANDELS ESO public spectroscopic survey
  19. Spilker et al, 2018 Molecular Gas Contents and Scaling Relations for Massive Passive Galaxies at Intermediate Redshifts from the LEGA-C Survey
  20. Lee et al, 2018 The intrinsic characteristics of galaxies on the SFR-stellar mass plane at 1.2
  21. Kocevski et al, 2017 CANDELS: Elevated Black Hole Growth in the Progenitors of Compact Quiescent Galaxies at z~2
  22. Pope et al, 2017 Early Science with the Large Millimeter Telescope: Detection of Dust Emission in Multiple Images of a Normal Galaxy at z > 4 Lensed by a Frontier Fields Cluster
  23. Williams et al, 2017 Morphology dependence of stellar age in quenched galaxies at redshift ~ 1.2: Massive compact galaxies are older than more extended ones
  24. Spilker et al, 2016 Low gas fractions connect compact star-forming galaxies to their z~2 quiescent descendants
  25. Williams et al, 2015 The interstellar medium and feedback in the progenitors of the compact passive galaxies at z~2
  26. Barro et al, 2014 CANDELS+3D-HST: compact SFGs at z~2-3, the progenitors of the first quiescent galaxies
  27. Williams et al, 2014 The Progenitors of the Compact Early-Type Galaxies at High-Redshift
  28. Lee et al, 2013 CANDELS: The Correlation between Galaxy Morphology and Star Formation Activity at z ~ 2
  29. Cassata et al, 2013 Constraining The Assembly Of Normal And Compact Passively Evolving Galaxies From Redshift z=3 To The Present With CANDELS
  30. Johnson et al, 2013 X-ray detections of submillimetre galaxies: active galactic nuclei versus starburst contribution
  31. Barro et al, 2013 CANDELS: The Progenitors of Compact Quiescent Galaxies at z ~ 2
  32. Bell et al, 2012 What Turns Galaxies Off? The Different Morphologies of Star-forming and Quiescent Galaxies since z ~ 2 from CANDELS
  33. Guo et al, 2012 Rest-frame UV-Optically Selected Galaxies at 2.3 <~ z <~ 3.5: Searching for Dusty Star-forming and Passively Evolving Galaxies
  34. Yun et al, 2011 Deep 1.1 mm-wavelength imaging of the GOODS-S field by AzTEC/ASTE - II. Redshift distribution and nature of the submillimetre galaxy population
  35. Williams et al, 2011 On the Clustering of Submillimeter Galaxies
  36. Scott et al, 2010 Deep 1.1mm-wavelength imaging of the GOODS-S field by AzTEC/ASTE - I. Source catalogue and number counts
  37. Druckenmiller et al, 2009 Toward an integrated coastal sea-ice observatory: System components and a case study at Barrow, Alaska
  38. Wilson et al, 2008 A bright, dust-obscured, millimetre-selected galaxy beyond the Bullet Cluster (1E0657-56)
  39. Knapp et al, 2004 Near-Infrared Photometry and Spectroscopy of L and T Dwarfs: The Effects of Temperature, Clouds, and Gravity