Most English universities are formally headed by "chancellors"; however, at University of Oxford and University of Cambridge, most colleges are headed by a "master" or a "principal" as the chief academic. In a few colleges, the equivalent person is called a "president", "provost", or "warden". At two Oxford colleges, Lincoln College and Exeter College, the head is called "rector". At Oxford and Cambridge, the university's overall head is called "chancellor", but this is chiefly a ceremonial position while the academic head of each university is the "vice-chancellor".