Deans may supervise various and more specific aspects of the institution, or may be CEOs of entire campuses. They may report directly to the president or chancellor. The division of responsibility among deans varies widely among institutions; some are chiefly responsible for clusters of academic fields (such as the humanities or natural sciences) or whole academic units (such as a graduate school or college), while others are responsible for non-academic but campus-wide concerns such as minority affairs. In some cases a provost supervises the institution's entire academic staff, occupying a position generally superior to any dean. In other instances the Dean of a College may be the equivalent to a Provost or Vice Chancellor or Vice President for Academic Affairs. Below deans in the administrative hierarchy are heads of individual academic departments and of individual administrative departments. These heads (commonly styled "chairs" or "directors") then supervise the faculty and staff of their individual departments.