Harvard University, one of the pre-eminent universities in the world, is the oldest institution of higher learning in the United States. Founded 16 years after the arrival of the Pilgrims at Plymouth, the University has grown from nine students with a single master to an enrollment of more than 18,000 degree candidates, including undergraduates and students in 10 principal academic units. Seven presidents of the United States – John Adams, John Quincy Adams, Theodore and Franklin Delano Roosevelt, Rutherford B. Hayes, John Fitzgerald Kennedy and George W. Bush – were graduates of Harvard. Its faculty have produced 40 Nobel laureates.