I study the very early universe, where both high energy particle physics and gravity play important roles. My research aims to build consistent models for the early universe and to make predictions for observations that can distinguish between different scenarios. We are guided by a steady stream of new observational input from current and near future surveys that measure the number and clustering of galaxies. I often work with astrophysicists to understand how to best use that data to constrain cosmological theories. This is an exciting time for cosmology with rapid, simultaneous developments in observations, numerical simulations, and theory. Many puzzles on the frontier of high energy particle physics and gravity merge in the early universe, making cosmology a rich and active area of research.