and pressures." The report has since been used to justify decisions such as the university's refusal to divest from South Africa in the 1980s and Darfur in the late 2000s. In 1969, more than 400 students, angry about the dismissal of a popular professor, Marlene Dixon, occupied the Administration Building for two weeks. After the sit-in ended, when Dixon turned down a one-year reappointment, 42 students were expelled and 81 were suspended, the most severe response to student occupations of any American university during the student movement. In 1978, history scholar Hanna Holborn Gray, then the provost and acting president of Yale University, became President of the University of Chicago, a position she held for 15 years. She was the first woman in the United States to hold the presidency of a major university. 1990s–2010s In 1999, then-President Hugo Sonnenschein announced plans to relax the university's famed core curriculum, reducing the number of required courses from 21 to 15. When The New York Times, The Economist, and other major news outlets picked up this story, the university became the focal point of a national debate on education. The changes were ultimately implemented, but the controversy played a role in Sonnenschein's decision to resign in 2000. From the mid-2000s, the university began a number of multimillion-dollar expansion projects. In 2008, the University of Chicago announced plans to establish the Milton Friedman Institute, which attracted both support and controversy from faculty members and The institute would cost around $200 million and occupy the buildings of the Chicago Theological Seminary. During the same year, investor David G. Booth donated $300 million to the university's Booth School of Business, which is the largest gift in the university's history and the largest gift ever to any business school. In 2009, planning or construction on several new buildings, half of which cost $100 million or more, was underway. Since 2011, major construction projects have included the Jules and Gwen Knapp Center for Biomedical Discovery, a ten-story medical research center, and further additions to the medical campus of the University of Chicago Medical Center. In 2014 the university launched the public phase of a $4.5 billion fundraising campaign. In September 2015, the university received $100 million from The Pearson Family Foundation to establish The Pearson Institute for the Study and Resolution of Global Conflicts and The Pearson Global Forum at the Harris School of Public Policy. In