Brian Siana

Assistant Professor of Physics and Astronomy

brian.siana [at]
Department of Physics and Astronomy
University of California, Riverside
900 University Ave
Riverside, CA 92521


I am primarily interested in understanding galaxy formation in the early universe and its effects on the intergalactic medium.  I use the Hubble and Spitzer Space Telescopes and the ground-based W. M. Keck Observatory to understand star formation processes in the early universe, determine a more accurate census of star formation, and estimate its effects on the intergalactic medium.  In particular, my latest research is focused on understanding how faint, dwarf galaxies ionized the hydrogen in the intergalactic medium in the first billion years (the so-called “reionization” of the universe).

Graduate Student Advising

Anahita Alavi – Luminosity functions and properties of lensed, high-redshift dwarf galaxies.
William Freeman –  Supernovae feedback, outflows, and “bursty” star formation.
Kaveh Vasei – Lyman continuum escape fraction and the ionizing background.
Louise Daniels – Stellar populations of high redshift dwarf galaxies.


PHYS 040A – Introductory Mechanics (for engineers and physical sciences)
PHYS 111 – Stellar Astrophysics (upper level physics majors)
PHYS 203 – Statistics and Data Analysis Techniques (for graduate students or advanced undergraduates)