As Chairman of the NRC, Dr. Jaczko is responsible for daily operations of the agency, and he also has authority for all NRC functions pertaining to a potential emergency involving an NRC licensee. His professional career has been devoted to science, and its use and impact in the public policy arena. He formerly served as appropriations director for U.S. Sen. Harry Reid and also served as the Senator's official science policy advisor. He began his Washington, D.C. career as a congressional science fellow in the office of U.S. Rep. Edward Markey. In addition, he has been an adjunct professor at Georgetown University teaching science and policy.