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- 1998-2006 Director, State Climate Office of North Carolina, A Public Service Center for Climate-Environment Interactions.
- 1996-2006 State Climatologist of North Carolina.
- 1986-present Professor, Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina.
- 1982-1986 Associate Professor, Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina.
- 1972-1982 Meteorologist, Atmospheric Sciences Division, Department of Energy and Environment, Brook Haven National Laboratory, New York.