His field of observational cosmology is really exciting right now. New data are coming in at a rapid pace, answering some questions and raising yet more. Currently, the cosmic microwave background (CMB) is the primary focus of my research. We can now make accurate maps of the small temperature fluctuations in the CMB, which allows us to test cosmological models, such as inflation, and estimate values for cosmological parameters, such as the total energy density Ωtot and the baryon density Ωb.