Tommaso Treu


1.   Galaxy Formation and Evolution. In particular early-type galaxies,  galaxies in clusters, and high redshift galaxies. Examples of my research can be found here.

2.  Co-evolution of spheroids and black-holes. Check out the AMUSE-Virgo website.

3.  Gravitational Lensing and dark matter in galaxies and clusters of  galaxies. Examples of my research can be found on the webpages of the LSD and SLACS projects.

4.  Cosmography from gravitational time delays, more details can be found here, and here.

5.  Galaxies at the epoch of reionization, more details can be found here.

For a more accessible description of my research, take a look at the following press releases (and you if you have nothing better to do you can listen to this public lecture of mine or this interview by Mike Shara):

2017. Cosmic lenses support finding on faster than expected expansion of the Universe

2015. Caught in the act: Hubble captures first-ever predicted exploding star

2015. Measuring a black hole mass with robotic telescopes

2015. Hubble Sees Supernova Split into Four Images by Cosmic Lens

2012. Abell 383: getting a full picture of an elusive subject

2012. Hubble pinpoints farthest protcluster of galaxies ever seen

2010. Astronomically Large Lenses Measure the Age and Size of the Universe

2008. A cosmic collision and the nature of dark matter

2008. SLACS: the complete ACS sample

2008. A Double Einstein Ring

2007. Tiny Galaxy with Cosmic Telescope

    (see also this link)

2005. SLACS Einstein Rings

2003. Dark Matter in Galaxy Cluster Cl0024

1998. An Extremely Red Galaxy

Research Interests:

Contact Information:


E-mail: tt AT

Professor at UCLA

students and postdocs:


Daniel Gilman (grad)

Anowar Shajib (grad)

Lilan Yang (visiting grad)

Xin Wang (grad)

Peter Williams (grad)

Xiao-Lei Meng (visiting postdoc)

Simon Birrer (postdoc)

Xuheng Ding (postdoc)

Austin Hoag (postdoc)


Group Alumni:


Louis Abramson (Carnegie-Princeton Fellow, OCIW)

Adriano Agnello (Dark, DK)

Matthew Auger (Rutherford Fellow, Cambridge, UK)

Matteo Barnabe' (Data scientist)

Vardha Bennert (Calpoly SLO)

Marusa Bradac (UC Davis)

Brendon Brewer (Auckland, NZ)

Aaron Dutton (NYU Abu Dhabi)

Elena Gallo (U Michigan)

Raphael Gavazzi (IAP Paris, F)

Tucker Jones (UC Davis)

Brandon Kelly (Goodyear Tire and Rubber Company)

Kai Liao (Wuhan University)

Philip Marshall (SLAC, Stanford)

Charlotte Mason (Hubble Fellow, CfA)

Takahiro Morishita (STScI)

Anna Nierenberg (NASA Fellow, JPL)

Anna Pancoast (Einstein Fellow, CfA)

Alessandro Sonnenfeld (Nova Fellow, Leiden, NL)

Kasper Schmidt (AIP, Potsdam)

Andreas Skielboe

Sherry Suyu (MPA, D)

Jonghak Woo (SNU, Korea)


We meet every week to eat pizza and discuss our research on gravitational lensing, galaxy evolution and black holes according to this schedule. If you are interested in attending please e-mail me or Daniel Gilman ( gilmanda AT

If you are looking for a PhD Thesis there are plenty of cool projects to work on. E-mail me if interested.


If you are a PhD Student abroad and you are interested in a visiting position in my group at UCLA feel free to contact me.



Introduction to Cosmology (ASTRO6)

Physics of Sustainable Energy (PHYSICS12), see pilot videos written in collaboration with Alex Kusenko here
and here


Publications (ADS server query)


Curriculum Vitae