Chief of planning City of Baltimore, 1976—1986, assistant director planning, 1986—1987. Assistant secretary for planning and capital programs Maryland Department Environmental, Annapolis, 1987—1991, secretary of environmental, 1991-1993. Assistant administrator for water Environmental Protection Agency, Washington, 1993—2001, deputy administrator, since 2009.
Senior vice president public policy National Audobon Society, 2001—2004, chief operating officer, 2004—2009. Vice president consulting & technical Information Technology Group Inc., 2001. Vice chairman Appalachian Low-Level Radioactive Waste Commission.
1st chairman Northeast Ozone Transport Commission. Board directors Chesapeake Bay Trust. Former member Maryland Governor's International Cabinet & Maryland Governor's Commission on Lead Paint Poisoning.
Co-chair California Bay Delta program policy committee.