Much of my research focuses on the shape and evolution of dark matter halos. I measure the concentrations of simulated halos to better determine the redshift dependence of the concentration-mass relation, which is sensitive to cosmological parameters, and to better understand how the shapes of halos change as they grow. During my six months at Kavli IPMU, I will also be working on using the bispectrum to improve measurements of the baryon acoustic oscillation length scale.