Daniel Bruce Poneman is an American lawyer and businessman. He served as United States Deputy Secretary of Energy from 2009 to 2014. He is also a Distinguished Fellow at the Paulson Institute at the University of Chicago and a Senior Fellow at the Belfer Center for Science and International Affairs at the Harvard Kennedy School. Poneman was Acting Secretary of Energy in 2013 following the resignation of Steven Chu until Ernest Moniz was confirmed and sworn in.