Cahill Radio Astronomy Lab

Tony Readhead


Prof. Readhead is the Robinson Professor of Astronomy at Caltech. His main areas of interest are observational cosmology, especially the cosmic microwave background radiation, and active galaxies, with special emphasis on the central engines that drive them and the formation of relativistic jets. In carrying out research in both these areas he is particularly interested in developing state-of-the-art instrumentation.

In 2009, with start-up funds from the Keck Institute for Space Studies, he set up the CRAL to design and build new recievers for cosmology and astrophysics.
(626) 395 4972 (office)
acr (at)

Kieran A. Cleary


Kieran is a Senior Scientist in the astronomy department at Caltech. He received his PhD in Radio Astronomy in 2004 from the University of Manchester (Jodrell Bank Observatory) on observations of the Cosmic Microwave Background temperature anisotropies using the Very Small Array (VSA). While a postdoc at JPL and Caltech, he worked hardware and data analysis for the QUIET experiment which measured the CMB polarization from Chajnantor in Chile. He now leads the Cahill Radio Astronomy Lab (CRAL) where the next generation of amplifiers and focal plane arrays for radio astronomy are being developed. As PI of COMAP, he leads an effort to intensity-map the redshifted carbon monoxide from the epoch of galaxy assembly, and ultimately, from the Epoch of Reionization. In his spare time he also works on the anomalous microwave emission, a dust-correlated foreground for CMB experiments.

(626) 395 3013 (office)
kcleary (at)

Todd C. Gaier


Dr. Todd Gaier is a Senior Research Scientist and the Supervisor for JPL’s Microwave Systems Technology Group as well as a Faculty Associate in Astronomy at Caltech. He is also a member of the Committee on Radio Frequencies of the National Academies of Science. He received his Ph.D in Physics from the University of California, Santa Barbara in 1993 studying the Cosmic Microwave Background (CMB). His research interests include millimeter wave electronics for applications in astrophysics and Earth remote sensing. His group develops technologies and instruments using monolithic microwave integrated circuit (MMIC) components operating at frequencies 1-250 GHz. Recent projects in the group include the Planck-LFI mission to study the anisotropy and polarization of the CMB; the Q/U Imaging Experiment (QUIET) exploring the polarization of the CMB; GeoSTAR an interferometric synthetic aperture imager for Earth atmospheric sounding from geostationary orbit; the Advanced Microwave Radiometers for the Jason III mission mapping small variations in sea level across the globe monitoring conditions such as El-Nino, the integrated receivers for the Juno Microwave Radiometers, the Compact Ocean Wind Vector Radiometer, a low cost alternative to ocean wind measurement and TEMPEST-D a CubeSat demonstrator for a mission to study temporal behavior of clouds and precipitation.

(818) 354 4402 (office)
todd.gaier (at)

Raquel R. Monje


Raquel received the M.S. degree in telecommunication engineering from Universidad Europea de Madrid, Madrid, Spain, in 2003, the M.S. degree in digital communications system and technology and the Ph.D. degree in radio and space science from Chalmers University of Technology, Gothenburg, Sweden, in 2004 and 2008, respectively. Her Ph.D. thesis was on low noise superconductor-insulator-superconductor (SIS) mixers for submillimeter and millimeter-wave astronomy.

She is currently a Senior Postdoctoral Scholar with California Institute of Technology, Pasadena. Her research interests include microwave technology, SIS mixers, millimeter and submillimeter wave heterodyne receivers for astronomy and the associated science resulting from observations.

(626) 395 4662 (office)
raquel (at)

Jacob W. Kooi


Jacob received the B.S. degree in microwave engineering from the California Polytechnic State University, San Luis Obispo, CA, in 1985, the M.S. degree in electrical engineering from the California Institute of Technology, Pasadena, in 1992, and the Ph.D. degree in physics from the Rijksuniversity Groningen, The Netherlands, in 2008.

His research interests include the areas of millimeter and submillimeter wave technology, low noise amplifiers, multipliers, instrumental stability, Fourier optics, and their application to astronomy.

Rohit S. Gawande


Rohit received the B.E. degree from the Government College of Engineering, Pune, India, in 2002, and the M.Sc. degree in radio astronomy and space science from Chalmers University of Technology, Gothenburg, Sweden, the M.S. degree in electrical engineering from California Institute of Technology, Pasadena. He received the Ph.D. degree at the University of Virginia, Charlottesville, with his dissertation work at the National Radio Astronomy Observatory, Charlottesville. Following his PhD, Rohit worked at the CRAL up to June 2015 as a Research Engineer where his focus was the cryogenic front-end modules for the Argus array.

Rohit is currently a Research Engineer at the Jet Propulsion Laboratory, working on technology development for the Surface Water Ocean Topography (SWOT) mission.

Rodrigo Reeves


Rodrigo obtained his PhD in Electrical Engineering from Universidad de Concepción, Chile. He joined the CRAL in 2009 as a postoc, becoming a Senior Scientist in 2012. While at the CRAL, Rodrigo worked on the characterization of HEMT transistors for radio astronomy and on technology development for radio astronomy receivers. He also participated in observational programs relating to the cosmic microwave background (CBI, CBI2, QUIET Q- and W-bands). Currently, he is involved in an AGN blazar monitoring program using the 40m telescope at OVRO/Caltech.

In 2014, he left to become Assistant Professor in the astronomy department at UdeC. He is the head of CePIA (Center for Astronomical Instrumentation) at UdeC, where the focus is on receiver development at frequencies from radio through the sub-millimeter or low-Terahertz. Rodrigo continues to collaborate with the CRAL on projects of mutual interest.

Oliver King


Oliver began his foray into astronomy at Rhodes University in South Africa before moving to Oxford where he designed and built the Northern C-BASS receiver as part of his DPhil studies in Astrophysics. After years of relentless cold and rain he jumped at the chance to move to Caltech in sunny SoCal where he continued to work on C-BASS, as well as the KuPol and RoboPol projects. He was a member of the CRAL from 2009 to 2014.