The president of Columbia University, who is selected by the trustees in consultation with the executive committee of the University Senate and who serves at the trustees' pleasure, is the chief executive officer of the university. Assisting the president in administering the university are the provost, the senior executive vice president, the executive vice president for health and biomedical sciences, several other vice presidents, the general counsel, the secretary of the university, and the deans of the faculties, all of whom are appointed by the trustees on the nomination of the president and serve at their pleasure. Lee C. Bollinger became the 19th president of Columbia University on June 1, 2002. A prominent advocate of affirmative action, he played a leading role in the twin Supreme Court cases—Grutter v Bollinger and Gratz v Bollinger—that upheld and clarified the importance of diversity as a compelling justification for affirmative action in higher education. A leading First Amendment scholar, he is widely published on freedom of speech and press, and serves on the faculty of Columbia Law School.