Dr. Green's major area of interest is the stellar structure, formation and evolution of hot subdwarfs: evolved, compact, He-core burning stars that have somehow lost all but a trace of their original envelopes before reaching the extreme blue tip of the horizontal branch. The majority of these objects are binaries. Although the exact formation channels are not yet understood, it is clear that multiple formation mechanisms are required. A significant fraction have recently been discovered to be multimode pulsators (both p- and g- modes), for which initial efforts at asteroseismology have been enormously successful. In collaboration with researchers at Montreal, Toulouse, and elsewhere, she has organized multiple large-scale photometric campaigns to provide state-of-the-art data for asteroseismic analysis. She is also working on two complementary surveys to determine atmospheric parameters and binary characteristics for large samples of subdwarfs.