Mary Ellen Callahan, JD Chair of Jenner & Block’s Privacy and Information Governance Practice, has unique and broad experience advising clients at the interface of privacy protection with cybersecurity and national security. A nationally recognized privacy attorney with two decades of outside counsel experience, she served as Chief Privacy Officer of the U.S. Department of Homeland Security from March 2009 until August 2012. She is a prolific writer and speaker on cutting-edge commercial privacy issues. She provides advice and counsel to an array of clients in industries that include media, public health and health care, manufacturing, online retail, government contracts, energy and other critical infrastructure sectors. In October 2013, Mary Ellen received the Privacy Vanguard Award, given by the International Association of Privacy Professionals, an annual award honoring the privacy professional who has demonstrated outstanding leadership, knowledge and creativity in privacy and data protection.