Research Interests: Astrophysics of energetic-particle acceleration at the Sun, in the heliosphere, and in the galaxy and of the secondary X-rays, gamma-rays and radio emission those particles produce. Design of particle telescopes and data acquisition and analysis systems.
Office: ATL 3243
Senior Research Scientist, IPST
Astrophysicist Emeritus, Code 661
Goddard Space Flight Center/NASA