J. Alex Halderman

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FILE - In this Nov. 30, 2016, file photo, J. Alex Halderman, a cyber security expert and professor of Computer Science at the University of Michigan, addresses the media in Lansing, Mich. Authorities say they're investigating after some students at the university received racist and anti-Semitic emails Tuesday, Feb. 7, 2017, purportedly from Halderman. Halderman denies sending the emails. (AP Photo/Carlos Osorio, File)