The University of California's campuses boast large numbers of distinguished faculty in almost every field and is widely regarded as one of the top public university systems in the world. Eight of its undergraduate campuses are ranked among the top 100, six among the top 50, and two among the top 25 U.S. universities by the "U.S. News and World Report". Six of its campuses are members of the Association of American Universities, a group of over 60 top U.S. and Canadian research universities. The current president of the University of California is Janet Napolitano.