1995- Professor and past-Chairman, Department of Civil and Environmental Engineering, University of Maryland
1988-1995- President and CEO, ConSolve Incorporated, Lexington, Massachusetts
1975-1988- Professor, Department of Civil Engineering, Massachusetts Institute of Technology.
1980-1981- Visiting Professor, Technical University Munich
1974-1975- Rockefeller Foundation Post Doctoral Fellow, International Institute for Applied Systems Analysis, Vienna
1972-1980- Captain (USAR), U.S. Army Corps of Engineers. Active duty 1972-1973; Reserves 1973-1980.
Water resources engineering and policy, Risk and safety analysis, Dam safety, Flood risk management, Environmental impacts of dams and water projects, Natural hazards, Infrastructure security.