Olszewski's current research efforts are in the following general areas:
1) Mass modeling and chemistry of dwarf spheroidal galaxies (multi-fiber spectrscopy); 2) structure and star-formation history of the Magellanic Clouds (from
two major imaging surveys); 3) fundamental, faint photometric standards for new imaging surveys with large telescopes (using HST for imaging and ground-based spectroscopy to derive gravity and temperature).