PhD 1973 U. of Colorado , Planetary Atmospheres NRL 1974-1989 Planetary Atmospheres, Space Sciences, Earth Sciences, Computational Physics Inc, 1989-1991 Earth and Space Sciences, Vice. Pres. 1991-2000 Earth Sciences, Radiative transfer, atmospheric chemistry NASA 1998-2009: 98-2000, Atmospheric Effects of Aviation Program, Manager 2000-2001 Radiation Sciences Program, Manager 2001-2003 NASA CS Radiation Sciences Program, Manager 2003-2009 NASA CS Modeling, Analysis and Prediction Program, Manager 6/2009-present JHU/APL IPA NOAA CPO, Modeling, Analysis, Predictions and Projections Program, Manager