Henry Freudenreich is a scientist at the Goddard Space Flight Center. He was with the Cosmic Background Explorer project from 1989 until its end in 1997. His research interests have included cosmic-ray physics and infrared astronomy. He is currently studying the electrodynamics of the earth’s ionosphere. Address: Code 696, NASA/Goddard Space Flight Center, Greenbelt MD 20771. Internet: henry.t.freudenreich.1@gsfc.nasa.gov