He was formerly a producer for Planet Money and a correspondent for National Public Radio.

He generally covers science and economic issues.

[2][3] Kestenbaum earned a Ph.D. in physics from Harvard University in 1996[2] 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.

[4] In 1997, Kestenbaum was selected as a AAAS Mass Media Fellow, working at a NPR affiliate radio station in Columbus, Ohio.

[5][6] This United States biographical article related to radio is a stub.