Founded in 1701, Yale began as an undergraduate college. In the nineteenth and twentieth centuries Yale added, one by one, the graduate and professional schools that now constitute a major university. Today, a combined total of more than 12,000 students in the undergraduate college, the graduate school, and the twelve professional schools study for thirty-six different degrees. A faculty of more than 4,000 men and women teach and administer programs across a range of disciplines in the sciences and engineering, the social sciences, the humanities, and the arts.