One focus of my current research is studying and measuring the gravitational lensing of the cosmic microwave background (CMB). Measurements of CMB lensing are interesting because they directly probe the high-redshift mass/dark matter distribution, and thus allow us to learn about both fundamental physics and extragalactic astrophysics. With new CMB experiments such as AdvancedACT and POLARBEAR-2, and upcoming experiments such as Simons Observatory and CMB Stage-IV, this field is expected to progress rapidly in just the next few years. I am leading some of the key lensing analyses for these collaborations, working towards strong constraints on neutrino masses, inflation, dark energy, and extragalactic astrophysics. (See here for a summary of my work for a general scientific audience, here for a nice summary of two of my earlier papers from APS Viewpoint.)

I am also interested in the Sunyaev-Zel'dovich effect from galaxy clusters, as well as in large scale structure theory, focused on baryon acoustic oscillations. My interests and papers also span quasars, the cosmic infrared background, neutrinos, and many other topics in cosmology, fundamental physics and extragalactic astrophysics. I enjoy working on both data-oriented theory and data analysis.