Lecture notes
Comprehensive notes and slides, from introductory cosmology to graduate-level astrophysical dynamics.
Browse downloadable PDFsExploring how galaxies form, how dark matter shapes them, and how the Universe evolves.

I am a Professor of Astronomy at Yale University. My research focusses on various aspects of cosmology, large scale structure, galaxy formation and dynamics. Among others, I study the Galaxy-Dark Matter Connection using Halo Occupation Statistics, study the structure and assembly of dark matter haloes, model the formation and evolution of disk galaxies, constrain cosmological parameters using galaxies as mass tracers, use galaxy groups to study galaxy quenching, and use constrained simulations to model the local Universe. I also use N-body simulations and analytical methods to study dark matter substructure, dynamical friction, impulsive heating and fuzzy dark matter. I have written over 200 papers in refereed journals (of which 35 as first author) and am also the author of the textbook Galaxy Formation and Evolution published by Cambridge University Press.
Comprehensive notes and slides, from introductory cosmology to graduate-level astrophysical dynamics.
Browse downloadable PDFsVideo lectures, summer schools, and research talks on galaxy formation and dark matter.
Watch the lecturesFall 2025: ASTR 5010, Dynamics of Astrophysical Many-Body Systems.
Visit the Yale course website
A textbook on the physical processes behind the formation and evolution of galaxies.
About the textbook