Team Members


mher.jpg Dr. Mher Kazandjian (2015-) is responsible for designing and implementing some of the algorithms that the European Science Ground Segment will use for reducing the near-IR observations from the future Euclid satellite. Mher is currently the chief programmer- developer for the Dutch contribution to the European Euclid effort.
holwerda.jpg Dr. Benne Holwerda (2013-2016) has been leading the Leiden effort (in collaboration with BoRG team) to obtain follow-up data on bright z~8 galaxies identified over the HST pure-parallel fields.   Benne led a successful cycle-24 program to obtain HST + Spitzer/IRAC observations on the bright candidates from this program.    With this program, we will secure a large sample of extremely bright z~8 galaxies for follow-up studies with JWST and the VLT.     Benne will move onto an assistant professor position at the University of Kentucky in December 2016.
stefanon Dr. Mauro Stefanon (2014-) is a postdoc in Ivo Labbe’s research team in Leiden, but has collaborated frequently with the Bouwens team.  Mauro has provided the first-ever determination of the luminosity function (LF) of galaxies at rest-frame optical wavelengths.   By comparing the evolution of the rest-frame optical LF with the evolution of the halo mass function, Mauro demonstrated that there is likely limited evolution in the stellar mass/halo mass ratio at z>=4.
themiya Dr. Themiya Nanayakkara (2017-) is a postdoc in the team of Rychard Bouwens, Jarle Brinchmann, and Ivo Labbe.   Themiya is an expert on the spectra of z=1-4 galaxies and has acted as a central postdoc in the ZFIRE spectroscopic program and possesses significant observing with MOSFIRE.
bruno Dr. Bruno Ribeiro (2017-) is a postdoc in the team of Rychard Bouwens, Jarle Brinchmann, and Ivo Labbe.  Bruno is an expert in both the spectra and morphologies of z=2-6 galaxies identified from the substantial VUDS program.
00b8e55 Dr. Hugo Buddelmeijer (2017-) is helping with the engineering of various modules in the near-IR pipeline for the future Euclid mission.   Hugo has significant scientific and programming experience designing an optical pipeline for the KIDS program and is using that experience to help with the engineering of the Euclid pipeline.

PhD Students

 d200x250 Leindert Boogaard (2016-) is a student in the Bouwens group (and also in the group of Paul van der Werf), combining MUSE and ALMA data to understand galaxy formation in the early universe.
 Lam.jpg Daniel Lam (2015-) is a PhD candidate in the group, observing the first galaxies and modeling the gravitational lensing effect of galaxy clusters
smit.jpg Dr. Renske Smit (2010-2015) was a PhD student in the Bouwens research group, doing some of the first discovery studies of extreme emission lines in z>=6 galaxies and the Star Formation Rate Function.   She defended her thesis in April 2015, did a short postdoc in Durham with Mark Swinbank, and then won a prestigious NWO Rubicon Fellowship to move to Cambridge University to work with Roberto Maiolino.
vanelteren Arjen van Eltern (2017-) is pursuing a PhD on the AMUSE project with Simon Portegies Zwart, while also working with me to do the engineering of various modules in the near-IR pipeline for the future Euclid mission.  Arjen is also working with postdocs Mher Kazandjian and Hugo Buddelmeijer on the Euclid project.

Master students

grobertsborsani Guido Roberts-Borsani (2014-2015) pioneered a new technique to select the brightest galaxies at z>7 showing prominent [OIII] line emission and applied it to CANDELS program.   All 4 bright z>7 sources Guido identified in his published paper showed a prominent Lyα emission line and were spectroscopically confirmed.  Two of the sources broke the high-redshift spectroscopic distance record and were featured in high-profile international press releases.   Guido is now a PhD student at UCL.
02ec0ab Nicholas Rasappu (2014-2015) investigated the impact of the Halpha on the Spitzer/IRAC colors of z~5 galaxies using a small sample of z~5.1-5.4 and z~4.6-5.0 galaxies.    Nicholas Rasappu found the impact of nebular emission lines on the measured fluxes of z~5 galaxies was much more prominent than for galaxies at lower redshift.  Nicholas’ results were sufficiently interesting to merit publication.   Nicholas now is working in finance and modeling international markets.
 algera Hiddo Algera (2016-) will be taking advantage of the deepest-ever observations with Spitzer/IRAC to investigate the prevalence and EW of the [OIII]+Hβ emission lines in z~7 galaxies.
Nikki Zabel is working with a postdoc in my group Benne Holwerda and Xander Tielens on a research project involving M51.

Undergraduate students

Lieke van Son, Robbie Brooymans, Isabel van Vledder, Dieuwertje van der Vlugt, Job van der Wardt, Marco Trueba van den Boom, Dennis Vandal, Lennard van Sluijs, Eva  van Weenen, Charlotte Brand, and Leandra Swiers are the names of Bachelor students who did research projects as part of my extended team, most of whom received daily supervision by Dr. Benne Holwerda.    The subject matter covered by these students was quite extensive and involved in mapping dwarf studies in our own Galaxy the Milky Way.  The results from this research project was published here and resulted in an International press release.


In the Netherlands

Our group collaborates closely with other groups in Leiden and also in the Netherlands, particular, with those in Ivo Labbe‘s group,  Marijn Franx‘s group, Paul van der Werf‘s group, Huub Rottgering’s group (specifically Jorryt Matthee), and Jarle Brinchmann‘s team.    Michael Maseda, a NOVA postdoc in Leiden and now a member of JWST NIRSPEC team, is also a valued collaborator.


On the topic of HST data and in future JWST data, the Bouwens group in Leiden maintains close collaborations with Pascal Oesch and Garth Illingworth.

On the ALMA side, the Bouwens group maintains good contact with the significant effort led by Fabian Walter, Chris Carilli, Manuel Aravena, and Roberto Decarli on the ASPECS observations over the HUDF, both the pilot program and new large program.  Our Leiden-based team is a core collaborator in that effort.

Another key connection for our Leiden-based group is Roland Bacon at CRAL in Lyon and the larger MUSE GTO team.