David Samuel Kestenbaum is an American radio producer for Planet Money and This American Life. He was formerly a correspondent for National Public Radio. He generally covers science and economic issues. Kestenbaum earned a Ph.D in physics from Harvard University in 1996 with a thesis entitled Observation of Top Quark Anti-Top Quark Production Using a Soft Lepton B Tag in Proton Anti-Proton Collisions at 1.8 TeV working under the supervision of Melissa Franklin. In 1997, Kestenbaum was selected as a AAAS Mass Media Fellow, working at a NPR affiliate radio station in Columbus, Ohio.