Bio

• Age: 41
• Education:  Cornell University, BS; University of Wisconsin, PhD
• From: Washington, DC
• Ethnicity: Caucasian
• Gender: Male

President Obama designated Jaczko chairman of the NRC on May 13, 2009. He had been serving as a commissioner since January 2005. A longtime opponent of the proposed spent fuel repository at Yucca Mountain, Nev., Jaczko's nomination was opposed by the nuclear industry and some influential Republicans.

Last Job

• Nuclear Regulatory Commission, commissioner

Other Jobs

• U.S. Senate, appropriations director and then science policy advisor, Senator Harry Reid (D-Nev.)
• Georgetown University, adjunct professor
• U.S. House of Representatives, congressional science fellow, Rep. Edward Markey (D-Mass.)