Tobias Marriage

Tobias Marriage is a Professor in the William H. Miller III Department of Physics & Astronomy at Johns Hopkins University, within the Krieger School of Arts & Sciences. He co-leads the Cosmology Large Angular Scale Surveyor (CLASS) project and contributed to the Atacama Cosmology Telescope (ACT) by designing its initial receiver and analysis pipeline. His research focuses on understanding the universe's evolution through measurements of the cosmic microwave background (CMB) and studying dusty star-forming galaxies (DSFGs) and galaxy clusters.

Education: PhD in Physics from Princeton University. He actively collaborates on large-scale cosmological surveys and develops cutting-edge instrumentation for millimeter-wave observations, including aerogel filters and polarization-sensitive detectors. His work addresses fundamental questions about cosmic inflation, reionization, and the thermal Sunyaev-Zel’dovich effect in galaxy clusters.

Research highlights include leading the CLASS telescope’s design and operations, analyzing ACT data for extragalactic point sources, and exploring quasar feedback mechanisms. His contributions span both observational cosmology and instrument innovation, with a focus on maximizing sensitivity and reducing noise in CMB measurements.

Notable projects include the CLASS experiment’s E-mode polarization measurements and efforts to characterize the physical properties of high-redshift DSFGs. He emphasizes the need for future space-based far-infrared telescopes to advance studies of these galaxies. His work also includes calibrating galaxy cluster masses via weak-lensing techniques and improving data analysis pipelines for large-scale surveys.