Founded in 1866, the American University of Beirut bases its educational philosophy, standards, and practices on the American liberal arts model of higher education. A teaching-centered research university, AUB has around 700 instructional faculty and a student body of around 8,000 students. The University encourages freedom of thought and expression and seeks to graduate men and women committed to creative and critical thinking, life-long learning, personal integrity, civic responsibility, and leadership. The University, which was granted institutional accreditation in June 2004 by the Commission on Higher Education of the Middle States Association of Colleges and Schools in the United States, includes six faculties: Agricultural and Food Sciences, Arts and Sciences, Engineering and Architecture, Health Sciences, Medicine (which includes the Rafic Hariri School of Nursing), and the Suliman S. Olayan School of Business. AUB currently offers more than 120 programs leading to the bachelor's, master's, MD, and PhD degrees. The University became coeducational in 1922; its student body is 50 percent male and 50 percent female. The language of instruction is English (except for courses in the Arabic Department and other language courses).The student faculty ratio is 11 to 1.