Graduated from Swarthmore College in 1982 and studied mathematical physics at the University of Cambridge as a Marshall Scholar. Received a Ph.D. in astronomy with an emphasis on pl...
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Graduated from Swarthmore College in 1982 and studied mathematical physics at the University of Cambridge as a Marshall Scholar. Received a Ph.D. in astronomy with an emphasis on planetary science from Cornell University in 1991. Served on the National Security Council staff and in the Office of Science and Technology Policy (OSTP) from 1993 to 1995. Member of the SETI Institute Board of Trustees from 2005 to 2007.