NEW HAVEN, Conn. (AP) -- Yale University President Richard C. Levin has announced he is stepping down at the end of the academic year after 20 years at the Ivy League school.

Levin has served longer than any other president currently in the Ivy League or the 61-member Association of American Universities.

Yale says Levin transformed the campus with the largest building and renovation program since the 1930s, dramatically expanded Yale's financial aid programs and international activities, improved the university's historically difficult relationship with its unions and built partnerships with New Haven.