The Survey of the MAgellanic Stellar History maps the Magellanic System with DECam in ugriz to resolve individual stars. Using resolved stellar populations, we study the formation and evolution of the Magellanic Clouds.

Our team developed the Bayesian Extinction and Stellar Tool (BEAST). I use the BEAST to fit the ultraviolet to near-infrared photometric SEDs of stars in NGC 4214 to extract stellar and dust extinction parameters.

I measured spatially resolved star formation histories of M81 using the color magnitude diagrams constructed from HST imaging data to test the density wave theory for its grand-design spiral arms.

I generated g-band difference images and constructed light curves to characterize the optical variability of both faint AGNs and quasars, and then classify AGNs based on their optical variability.

We examined the Fundamental Planes of early-type galaxies and revealed a certain group of UV-excess early types that bridge between post starburt galaxies and quiescent red galaxies.