"Callahan, Mary Ellen"@en . "Mary Ellen Callahan was a Chief Privacy Officer and Chief Freedom of Information Act Officer (FOIA) (2009 - 2012) of the United States Department of Homeland Security.She was appointed by Secretary Napolitano in March 2009. Callahan is a graduate of the University of Pittsburgh, on whose Board of Trustees she sits, and The University of Chicago Law School."@en . "US Department of HOmeland Security officer" .