Meet the Bloggers

Guillermo Barro

Guillermo Barro is a postdoctoral researcher at the University of California, Santa Cruz. He is part of the CANDELS and AEGIS collaborations, leading the efforts to assemble multiwavelength galaxy catalogs in the most important deep fields. He is also the web master of the Rainbow Cosmological Surveys Database. His primary scientific interests are in studying the early assembly of the most massive galaxies and the mechanisms responsible for quenching of star formation. View all of Guillermo's posts here.

Eric Bell is an Associate Professor in the Department of Astronomy at the University of Michigan. His studies focus on observational investigation of the physics of galaxy evolution using large survey datasets from the Hubble Space Telescope, the Sloan Digital Sky Survey, PanSTARRS1, and Magellan. A few questions he's currently thinking about are: Why do some galaxies grow through star formation, while others long ago ceased to form new stars? How frequently do galaxies interact with each other? What are the effects of these interactions? View all of Eric's posts here.


Karina Caputi

Karina Caputi is Assistant Professor and Rosalind Franklin Fellow at the Kapteyn Astronomical Institute, University of Groningen, in the Netherlands. Her research focuses on the multi-wavelength study of infrared-selected galaxies at different redshifts: massive galaxies (selected in the near- and mid-infrared), and dusty star-forming galaxies (selected in the mid- and far-infrared). View all of Karina's posts here.

Darren Croton
Darren Croton is an Associate Professor and QEII Research Fellow at the Centre for Astrophysics and Supercomputing at Swinburne University in Melbourne, Australia. He is a theorist who works on the formation and evolution of galaxies in the local and high redshift Universe, using both simulations and large observational data sets. His primary area of expertise is semi-analytic modelling. He is a member of a number of large international survey teams, including CANDELS, the Spitzer Warm Mission Extended Deep Survey (SEDS), the WiggleZ Galaxy Redshift Survey, and the AEGIS Collaboration. He was also a significant contributor to the analysis of the 2dF Galaxy Redshift Survey, and has worked closely with the Virgo Consortium on the Millennium N-body dark matter simulation. View all of Darren's posts here.
Romeel Dave'

Romeel Dave' is an Associate Professor of astronomy at the University of Arizona who studies galaxy formation using supercomputers. View all of Romeel's posts here.

Mark Dickinson

Mark Dickinson is an Associate Astronomer on the scientific staff of the National Optical Astronomy Observatory, in Tucson, Arizona. His research focuses on the use of deep field observations at many different wavelengths to study the formation and evolution of galaxies in the distant universe.  He was a member of the team that carried out the Hubble Deep Field observations with the Hubble Space Telescope, and later was principal investigator for The Great Observatories Origins Deep Survey (GOODS) Spitzer Legacy Program, as well as for far-infrared observations of the GOODS and CANDELS fields with Spitzer and now with the Herschel Space Observatory. View all of Mark's posts here.

Timothy Dolch

Timothy Dolch recently finished his PhD at the Johns Hopkins University and the Space Telescope Science Institute in Baltimore, MD. He is now a postdoctoral researcher at Oberlin College in Oberlin, OH. His interests include large scale diffuse structures and cosmological backgrounds, including the turbulent interstellar medium, the stochastic gravitational wave background, and the optical/infrared background and its fluctuations. View all of Timothy's posts here.

Sandy Faber is a staff astronomer and faculty member at the University of California Observatories at UC Santa Cruz. Her scientific interests are galaxy formation and astronomical instrumentation, including the Hubble project.  She is currently serving as co-PI on the CANDELS survey and is interested in using CANDELS images to study the emergence of modern Hubble morphologies near redshift z ~ 2. View all of Sandy's posts here.

Harry Ferguson

Harry Ferguson is an astronomer at the Space Telescope Science Institute, and co-Principal Investigator for the CANDELS project. He has worked on observations of deep space since the original Hubble Deep Field in 1996. He is interested in a broad range of topics from explaining the brightness of the night sky, to understanding the evolution of dwarf galaxies, to measuring the change in the expansion rate of the universe.  He is also active in preparing for the James Webb Space Telescope and the Large Synoptic Survey Telescope. View all of Harry's posts here.

Steven Finkelstein is an Assistant Professor in the Department of Astronomy at the University of Texas at Austin.  His interests lie in the discovery and characterization of the most distant galaxies in the universe, in order to learn more about our origins, and how galaxies evolve.  He lives in Austin with his wife Keely (also an astronomer), and their 2-year old son Kieran. View all of Steven's posts here.

Norman Grogin
Norman Grogin is an Associate Scientist at the Space Telescope Science Institute, where he is an observational extragalactic astronomer supporting the Hubble Space Telescope's Advanced Camera for Surveys. His research interests include galaxy formation and evolution, the phenomenon of active galactic nuclei (AGN), and AGN-galaxy co-evolution. In CANDELS, he leads the Working Group for Observations Planning and Scheduling. He has played a similar role in other large spaced-based programs such as the earlier Great Observatories Origins Deep Survey (GOODS) with both Spitzer and Hubble, and the more recent Hubble UVUDF.  View all of Norman's posts here.

Jeyhan Kartaltepe

Jeyhan Kartaltepe is a Hubble Fellow at the National Optical Astronomy Observatory in Tucson, Arizona. Her primary scientific interests are in the role that galaxy mergers play in galaxy evolution, star formation, and the feeding of black holes and how this role has changed over cosmic time. She is an active member of several collaborations, including CANDELS, COSMOS, and GOODS-Herschel. View all of Jeyhan's posts here.

Dale Kocevski is an assistant professor in the Physics and Astronomy Department at the University of Kentucky in Lexington. He is the group leader for the CANDELS AGN team and an active member of the AEGIS collaboration. His primary scientific interests are in studying the role that supermassive black holes play in galaxy evolution and how environment affects the star formation and nuclear activity of galaxies. View all of Dale's posts here.

Anton Koekemoer
Anton Koekemoer is a research astronomer at the Space Telescope Science Institute. His main research interests are the formation and growth of black holes in the early universe, and their subsequent co-evolution with galaxies through cosmic time. He has been in charge of producing the large Hubble imaging mosaics for many projects in which he has been an active member for over a decade, including GOODS, COSMOS, AEGIS, the Hubble Ultra Deep Field, and most recently CANDELS, among others. He has also been involved in supporting the imaging cameras on Hubble and preparing for the James Webb Space Telescope. View all of Anton's posts here

David Koo

I am faculty in the Department of Astronomy and Astrophysics at the University of California, Santa Cruz with a joint appointment as staff astronomer of the University of California Observatories/Lick Observatory. My main research interests over the last 35 years have been to push technology and the largest telescopes in the optical and near-infrared to explore the early assemblage, nature, and transformations of galaxies and supermassive black holes (known generically as Active Galactic Nuclei or AGN) through deep multi-wavelength surveys using spectroscopy and imaging. View all of David's posts here.

Elizabeth McGrath

Elizabeth McGrath is an assistant professor in the Department of Physics and Astronomy at Colby College in Maine.  She is an observational astronomer whose research focuses on the formation and evolution of galaxies more massive than the Milky Way.  Specifically, she is interested in determining which physical mechanisms are responsible for the cessation of star formation and the assembly of mass over time.

Janine Pforr

Janine Pforr recently finished her PhD at the University of Portsmouth, in the United Kingdom, and is currently working as a Postdoctoral Researcher for CANDELS at the National Optical Astronomy Observatory in Tucson, Arizona. Her interests are the stellar population properties of galaxies, e.g. stellar mass, galaxy evolution and multiwavelength surveys. View all of Janine's posts here.

Lauren Porter

Lauren Porter is a graduate student at the University of California, Santa Cruz. Her research focuses on using semi-analytic modeling to examine the formation and evolution of massive elliptical galaxies. As part of the CANDELS collaboration, Lauren is studying the growth of massive compact galaxies at high redshift. View all of Lauren's posts here.

Steve Rodney is a Hubble Post-doctoral Fellow at The Johns Hopkins University in Baltimore, Maryland. He is the group leader for the CANDELS Supernova Team, and also manages the supernova search for CLASH, another large HST survey. Steve is measuring the supernova explosion rate in the early universe and using those rates to learn about supernova progenitor systems. View all of Steve's posts here.

David Rosario is a junior research scientist at the Max Planck Institute for Extraterrestrial Physics in Garching, Germany. He is interested in the energetics of Active Galactic Nuclei (AGN) and their relationship to galaxies, in particular questions like: What processes bring gas into an AGN? How do AGN feed their energy back to their hosts and drive outflows? Do AGN influence the formation of stars in galaxies? View all of David's posts here.

Mara Salvato
Mara Salvato is a staff member at Max- Planck Institute  for Extraterrestrial Physics, in Garching, Germany. She is an active member of several collaborations, including CANDELSCOSMOSEMU and, recently eROSITA, the next all-sky Xray mission. She wants to understand the role of the AGN phase in galaxy evolution. For doing that a major ingredient is to know the  accurate distance (redshift) of as many AGN as possible. That's why she looks at the X-ray sky (most of the AGN are shining at this wavelength)  and computes the redshift for all of the sources by using multi-wavelength photometry and a technique called "photometric  redshift". View all of Mara's posts here.

Rachel Somerville

Rachel Somerville holds the Downsbrough Chair in Astrophysics at Rutgers University, where she is a Full Professor. She received her BA from Reed College and her PhD from the University of California, Santa Cruz. Her interests include galaxy formation, cosmology, large scale structure, and multi-wavelength surveys. View all of Rachel's posts here.

Harry Teplitz

Harry Teplitz is a research scientist with the Infrared Processing and Analysis Center at Caltech in Pasadena, CA. He is the Science Lead for the NASA/IPAC Infrared Science Archive (IRSA). His research interests include the formation/evolution of galaxies, the reionization of the Universe, and dark energy. View all of Harry's posts here.
Jonathan Trump
Jonathan is an observational astronomer who studies active galaxies: that is, galaxies with an accreting supermassive black hole. Currently a postdoc at UC Santa Cruz, Jonathan is particularly interested in the co-evolving growth of black holes and galaxies: how do galaxies feed their black holes, and how do black holes influence star formation in their host galaxies? Because active galaxies emit over a wide range of energies, Jonathan uses telescopes spanning the electromagnetic spectrum: observing in X-rays (Chandra, XMM-Newton), ultraviolet (GALEX), optical (Hubble, Keck, Subaru, Magellan), infrared (Spitzer), and radio (VLA) light. View all of Jonathan's posts here.

Arjen van der Wel is a postdoctoral researcher at the Max Planck Institute for Astronomy in Heidelberg, Germany. His research has mostly focussed on the evolution of massive galaxies. Through observations provided by surveys such as CANDELS he has constructed a description of the processes that drive their formation history and growth. More  recently, his attention shifted to an unexpected discovery in the CANDELS data: a population of very small galaxies caught in the act of their initial formation. View all of Arjen's posts here.

Carolin Villforth

Carolin Villforth is currently a postdoctoral researcher at University of Florida. Her primary scientific interests are understanding how Active Galactic Nuclei are triggered and how they are connected to the evolution of their host galaxies.

Tao Wang

Tao Wang is a junior research scientist at the Nanjing University in Nanjing, China. He is now mainly working on the relation between structure and stellar population contents of massive galaxies since z~2, and how star-forming galaxies are transformed into quiescent galaxies. He is also interested in AGN and their role in galaxy evolution. View all of Tao's posts here.

Benjamin Weiner

Benjamin Weiner is an assistant astronomer at Steward Observatory at the University of Arizona, in Tucson.  He is co-responsible for planning and processing CANDELS grism observations.  His research interests include studying galaxy evolution through star formation and kinematics, using spectroscopy and near- and far-infrared observations; the links between short and long lived phases of galaxy evolution; gaseous outflows from galaxies and their link to quasar absorption lines and the circumgalactic medium; and astronomical instrumentation. View all of Benjamin's posts here.

Tommy Wiklind
Tommy Wiklind is an Associate Astronomer at the European Southern Observatory, associated with the Joint ALMA Observatory in Santago Chile. His research ranges from the molecular interstellar medium in galaxies, near and far, to multi-wavelength observations of distant galaxies. The overall aim is to understand how galaxies form and evolve. He got introduced into deep field observations while working at the STScI and has never looked back. In his spare time, he's trying to fit synthetic spectral energy distributions to as many galaxies as possible, hoping to learn something about their properties. View all of Tommy's posts here.


Christina Williams is currently a graduate student at the University of Massachusetts-Amherst working with the CANDELS collaboration. She is interested in the clustering of galaxies, and what causes galaxies to quench their star-formation early in cosmic time. View all of Christina's posts here.

Stijn Wuyts

Stijn Wuyts is a junior research scientist at the Max Planck Institute for Extraterrestrial Physics in Garching, Germany.  In order to understand the life path of galaxies, he investigates how their global structure (whether they are disks or spheroids, big or small) relates to their stellar population content: How many stars a galaxy has formed?  When?  How many stars it is still forming?  And in which conditions?  In addition to studying the global properties of distant galaxies, he also uses Hubble’s sharp eye to dissect the spatially resolved stellar populations within them. View all of Stijn's posts here.