Hi there, and welcome! I’m an astrophysicist with the Chandra X-ray Center working at the Harvard-Smithsonian Center for Astrophysics. My research is focused on X-ray binary systems, particularly “stellar-mass” black holes. My colleagues and I are working to measure the spins of these black hole systems, and to study their accretion properties as well. jsteiner -at- cfa.harvard.edu .