Legendary documentarian Frederick Wiseman goes back to school for this intimate and sprawling film. “At Berkeley” is a revealing four-hour documentary about the University of California at Berkeley, one of the finest research and teaching facilities in the world. Eschewing narration and standard interviews, Wiseman’s film takes viewers from faculty meetings to classrooms, from financial aid seminars to research laboratories, to show the myriad aspects of university life. Filmed during the fall 2010 semester, the film reveals the administration’s struggles to maintain the academic excellence, public role and diversity of the student body in the face of drastic budget cuts imposed by the State of California. Wiseman reveals the complex relationships among the school’s various constituencies — students, faculty, administrators, alumni, the City of Berkeley, the State of California and the federal government.