Professor, CITAAstrophysical sources of high energy radiation (Soft Gamma Repeaters, Anomalous X-ray Pulsars, Gamma-Ray Bursts), relativistic fluids and magnetofluids, supernova core collapse, accretion flows and — intermittently — the early universe.Ph.D. 1988 Princeton
Professor, Status OnlyAstrophysical dynamics, structure and dynamics of galaxies and stellar systems, supermassive black holes, extrasolar planets, solar system dynamics, planet formation, comets.Ph.D. 1975, Princeton