James Steven Bullock

picture of James Steven Bullock

Professor, Physics & Astronomy
School of Physical Sciences

Ph.D., UC Santa Cruz, 1999, Physics
M.S., UC Santa Cruz, 1995, Physics
B.S., The Ohio State University, 1994, Physics and Mathematics

Phone: (949) 824-7727
Email: bullock@uci.edu

University of California, Irvine
2127 Frederick Reines Hall
Mail Code: 4575
Irvine, CA 92697
Research Interests
Dark Matter, Dwarf Galaxies, Milky Way, Cosmology, Large Scale Structure, Galactic Astronomy, Early Universe Physics
Hubble Fellowship, Harvard University, 2002-2004
Postdoctoral Fellowship, The Ohio State University, 1999-2002
Research Abstract
Aided by super-computer simulations and analytic models, James studies how galaxies and their constituent dark matter halos form and evolve over billions of years. By analyzing data that astronomers have collected using the Hubble Space Telescope, the Keck Observatory, and other ground and space telescopes, James concentrates on understanding how galaxies, including the Milky Way and its Local Group of galaxies emerged from the primordial universe.
Short Biography
Academic Career: Professor Bullock received a B.S. in both Physics and Math from The Ohio State University in 1994 and a Ph.D. in Physics from the University of California, Santa Cruz in 1999. After postdoctoral positions at The Ohio State University and Harvard University, he came to UC Irvine as an Assistant Professor in 2004. He was elected Fellow of the American Association for the Advancement of Science in 2008. Professor Bullock served as the 17th Chair of the UCI Physics and Astronomy Department from 2017-2019 before becoming the 9th Dean of the UCI School of Physical Sciences in 2019.

Activities: Professor Bullock currently serves as Chair of the James Webb Space Telescope User’s Committee. Previously he was Chair of the working group that recommended the Hubble Frontier Fields Program. He is passionate about science outreach and appears regularly on the Science Channel’s How the Universe Works.
"Stealth Galaxies in the Halo of the Milky Way", J. S. Bullock, K. Stewart, M. Kaplinghat, E. J. Tollerud, J. Wolf, 2010, The Astrophysical Journal, 717, 1043
"Accurate masses for dispersion-supported galaxies", J. Wolf, G. D. Martinez, J. S.
Bullock, M. Kaplinghat, M., Geha, R. Munoz, J. D. Simon, F. Avedo, 2010, Monthly Notices of the Royal Astronomical Society, 406, 1220
"The Destruction of Thin Stellar Disks Via Cosmologically Common Satellite Accretion Events", C. Purcell, J. S. Bullock, and S. Kazantzidis, The Astrophysical Journal Letters, 691, 98L
``A Common Mass Scale for Milky Way Satellites", L.E. Strigari, J.S. Bullock, M. Kaplinghat et al., Nature, 2008, 454, 1096
``Redefining the Missing Satellites Problem'', L. E. Strigari, J.S. Bullock, M. Kaplinghat et al., The Astrophysical Journal, 2007, Volume 669, Issue 2, pp. 676-683
``Close Galaxy Counts as a Probe of Hierarchical Structure Formation", J. Berrier, J. S. Bullock et al., The Astrophysical Journal, 2006, Volume 652, Issue 1, pp. 56-70
``Tracing Galaxy Formation with Stellar Halos", J. S. Bullock and K. V. Johnston, The Astrophysical Journal, 2005, Volume 635, Issue 2, pp. 931-949
``Multi-Phase Galaxy Formation: High Velocity Clouds and the Missing Baryon Problem'', A. H. Maller and J. S. Bullock, 2004, Monthly Notices of the Royal Astronomical Society, 355, 694
``Halo Substructure and the Power Spectrum'', A. R. Zentner and J. S. Bullock, 2003, Astrophyscial Journal, 598, 49
"Inflation, Cold Dark Matter, and the Central Density Problem'', A. R. Zentner and J. S. Bullock, 2002, Physical Review D, 66, 43003
"Profiles of Dark Halos: Evolution, Scatter, and Environment", J.S. Bullock, T.S. Kolatt, R. Somerville, Y. Sigad, A.V. Kravtsov, A.K. Klypin, J.R. Primack, and A. Dekel, 2001, Monthly Notices of the Royal Astronomical Society, 321, 559
``Reionization and the Abundance of Galactic Satellites'', J.S. Bullock, A V. Kravtsov, and D.H. Weinberg, 2000, ApJ, 539, 517
``Non-Gaussian Fluctuations and Primordial Black Holes from Inflation,'' J.S. Bullock and J.R. Primack 1996, Physical Review D 55, 7423.
Professional Societies
American Astronomical Society
Sigma Xi
Research Centers
Center for Cosmology, School of Physical Sciences
Center for Galaxy Evolution
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