Two university proctors, elected annually on a rotating basis from two of the colleges, are the internal ombudsmen who make sure that the university and its members adhere to its statutes. This role incorporates student discipline and complaints, as well as oversight of the university's proceedings. The university's professors are collectively referred to as the Statutory Professors of the University of Oxford. They are particularly influential in the running of the university's graduate programmes. Examples of statutory professors are the Chichele Professorships and the Drummond Professor of Political Economy. The various academic faculties, departments, and institutes are organised into four divisions, each with its own head and elected board. They are the Humanities Division; the Social Sciences Division; the Mathematical, Physical and Life Sciences Division; and the Medical Sciences Division.