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My research focuses of the physical conditions in the outer atmospheres (chromospheres and coronae) of late-type stars and how stellar magnetic activity and winds evolve over a stars' lifetime. These studies follow the atmospheric evolution from young newly-formed stars, to main-sequence dwarf stars, and into the giant and supergiant phases. I use a wide range of space-based observations (HST --- particularly in the ultraviolet; Chandra, XMM, and Swift for X-ray observations; Kepler for optical photometric time series) and ground-based telescopes in the radio and optical.