Between 1982 and 1987 he worked at the Marconi Research Centre, Chelmsford, england, on moving target imaging with SAR, aircraft SAR motion compensation, SAR design studies and image quality assessment. Since March 1987 he has been employed by the Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, as a radar systems specialist and group supervisor. His group is responsible for calibration of the SIR-C data products and studies of advanced radar systems. His current research interests are in the field of multi-frequency, multi-polarization SAR calibration and in classification and information extraction from SAR imagery.

Dr. Freeman is chairman of the Committee on Earth Observing Sensors (CEOS) Working Group on SAR calibration. He is a principal investigator on three NASA-sponsored studies: one on SIR-C calibration, one on Calibration and Change Detection using Alaska SAR Facility ERS-1 data, and one on geographical information systems.

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