1993, Doctorate in Physics, University of California, Berkeley. 1989-92, NASA Graduate Student Research Fellow. Currently, Benjamin M. Rosen Professor of Physics and Astronomy, Space Radiation Laboratory, California Institute of Technology, Pasadena. Principal investigator of NASA's Nuclear Spectroscopic Telescope Array (NuSTAR), a small explorer-class mission launched in 2012. Primary research interests are in experimental and observational high-energy astrophysics. Has an active observational programme in gamma-ray, X-ray and optical observations of gamma-ray bursts, active galaxies and neutron stars. Recipient: Robert A. Millikan Prize Fellowship in Experimental Physics (1993); Presidential Early Career Award (2000); NASA Outstanding Public Leadership Medal (2013). Named one of America's Best Leaders, U.S. News and the Kennedy School of Government (2008).