I am an experimental cosmologist whose research focuses on measurements of the temperature and polarization anisotropy of the cosmic microwave background (CMB), clusters of galaxies, studies of structure formation, and sub-mm and mm-wavelength detector development. 

I am interested in the following cosmological questions:  What is the nature of dark energy?  What is the energy scale of Inflation?  What high energy physics was responsible for it?  What is the mass of the neutrino?  What can the growth of cosmic structures tell us about the universe?  When did the first stars form and what was the mechanism for the re-ionization of the universe?  I study the cosmic microwave background (CMB) and clusters of galaxies to try and answer these questions. 

Galaxy clusters are also one of the few families of objects in which we can observe the distribution of the three dominant matter components in the universe; stars and galaxies, hot gas, and dark matter.  Through multi-wavelength observations, we can learn about the interplay of these components; including the history of galaxy formation and metal production, and feedback from active galactic nuclei.