Oxford University Press (OUP) is the largest university press in the world, and the second-oldest, after Cambridge University Press. It is a department of the University of Oxford. It is governed by the Delegates of the Press. This is a group of 15 members of the university. They are headed by the Secretary to the Delegates, who serves as OUP' s chief executive and as its major representative on other university bodies. Oxford University has been using this system of contol since the 17th century.