chairman. During her tenure at Hearst Magazines, the company expanded to publish 200 editions around the globe, launched O, The Oprah Magazine and Food Network Magazine, formed COMAG MARKETING GROUP (CMG) with Condé Nast and acquired the assets of Gruner+Jahr U.K., Seventeen, Veranda magazine and iCrossing, a digital marketing agency. She has been a member of the board of directors of IBM and The Coca-Cola Company, Hearst Corporation, Advertising Council, United Way of America and Gannett Co. Inc. She is a member of the Council on Foreign Relations She is also on the National Leadership Board of Harlem Village Academies and a Trustee of the University of Notre Dame. In Black's nearly 20 years on the Coke board and on "a company committee that focused on policy issues including obesity and selling soda to children," Bloomberg and others opposed the company and other manufacturers' sales efforts in schools. Black resigned her position on the Coke board after the NYC nomination, citing potential conflicts of interest. She was paid over $2 million in cash and stock over her tenure on the board, and still owns over $3 million worth of company stock. The mayor reiterated both the school policy against soda sales and his support for Black when the subject was raised after the nomination. Donald McHenry, "a longtime Coke board member and a professor at Georgetown University who sat on the committee" with Black, confirmed that the issue had faced the board continuously but did not address Black's position or individual role in the internal company debates, decisions and actions. Schools chancellor As chancellor, Black was head of the New York City Department of Education, the largest public school system in the United States, which serves more than 1.1 million students in more than 1,600 schools. She resigned, after much controversy, on April 7, 2011. Controversy Having neither three years of teaching experience nor a master's degree nor a professional degree in educational management, Black required a waiver from the New York State Education Department under Education Commissioner David M. Steiner. The waiver was granted by Steiner, with Black's shortfall in formal qualifications "offset by the appointment of a chief academic officer to serve by her side [as well as her] 'exceptional record of successfully leading complex organizations and achievement of excellence in her endeavors.'" Black appointed Shael Polakow-Suransky to the academic-officer role, and assumed her post January 1, 2011.