• Welcome!

    I am a professional astronomer and postdoc at the University of California, Los Angeles (USA), working on the formation and evolution of galaxies across cosmic time.

    Scroll down to find out more!

A brief history of me...

My name is Guido Roberts-Borsani, I'm a postdoc at the University of California, Los Angeles (UCLA) working on galaxy formation and evolution in the first billion years of the Universe in Prof. Tommaso Treu's group. Below you can find a brief summary of my education and career to date.

I completed an MPhys degree (First Class) in Astronomy, Space Science & Astrophysics at the University of Kent in 2014, while also spending a year at the University of California, San Diego. Following the completion of my MPhys, I worked at the European Space Agency (ESTEC) in the Netherlands as a research intern and subsequently remained in the country to work at Leiden University where I contributed to numerous scientific publications on high-z galaxies. I began my Ph.D at UCL in the early months of 2015 working with Dr. Am‌élie Saintonge (primary supervisor) and Prof. Richard Ellis (secondary supervisor) on the baryonic cycle of gas in and out of galaxies of the local Universe in the form of inflows and outflows. I successfully defended my thesis in July of 2019 and have since started a postdoc at UCLA working with Prof. Tommaso Treu on ultra high redshift galaxies in preparation for the arrival of the James Webb Space Telescope.

For more information, download my full CV or see a list of my publications on NASA ADS. Alternatively, scroll down to read about my past and current research.


Summary of my research.

Astronomers try to map out the mass build-up of galaxies over cosmic time. To do this, we must understand the key periods and phenomena that shape galaxies, their surroundings, and the Universe as we whole. My research interests fall under two broad categories: gas inflows and outflows that regulate the gas content, star formation, and metallicities in and around galaxies, and a period of the early Universe called the "Epoch of Reionization", when the first stars and galaxies formed.

To observe these galaxies and phenomena, astronomers require powerful telescopes to build up large samples with which to understand their properties. My research makes use of optical, near-infrared, sub-millimetre and radio data coming from several space- and ground-based telescopes (e.g., Hubble Space Telescope/WFC3, Spitzer Space Telescope/IRAC, Keck/MOSFIRE, VLT/X-Shooter, IRAM 30m, Arecibo). The majority of my work makes use of large dedicated surveys such as the SDSS DR7, SDSS-IV/MaNGA, xCOLD GASS, and ALFALFA.

For a more in-depth look at my research, click on any of the thumbnails below.


Should you wish to contact me, please use the details highlighted below. I am also a keen partaker in outreach talks and public science communication, so please get in touch if this is something of interest.

Department of Physics & Astronomy, University of California, Los Angeles, 475 Portola Plaza, CA 90095, USA