NASA employee 1962-1992. Positions included Nimbus-7 Project Scientist, originator and manager of the Ozone Processing Team for BUV and SBUV/TOMS, and MODIS Data Systems Scientist. University of MD Geography Department, Research Professor, 1992-1998. Proprietor of PITA Analytic Sciences 1998 to present. Tasks have included Phase B Study Manager of EOSDIS, Deputy Team Leader for Data Systems on the U.S. Science Team for the OMI instrument on EOS Aura, and currently member of the NASA Science Teams for the Ozone Mapping and Profiling Suite instruments on the NPP Spacecraft.