CHARLES ELACHI, PhD, is Director of NASA's Jet Propulsion Laboratory and Vice President at the California Institute of Technology, where he is also Professor of Electrical Engineering andPlanetary Science. Dr. Elachi is internationally recognized for his role in the development of a series of spaceborne imaging radars for Earth and planetary observations.
JAKOB van ZYL, PhD, is Director for Astronomy and Physics at the Jet Propulsion Laboratory, and a Lecturer in Electrical Engineering and Geological and Planetary Sciences, California Institute of Technology. Dr. van Zyl is internationally recognized for his role in the development of imaging polarimetric radars and the associated data analysis and interpretation.