Historically, many of the prestigious universities in the United States have been private, most notably the Ivy League. However, some public universities are also highly prestigious and increasingly selective: Richard Moll designated such prestigious public universities Public Ivies. UC Berkeley, for instance, is often ranked as a top-ten university in the world and the top public university in the United States. There are a number of public liberal arts colleges, including the members of the Council of Public Liberal Arts Colleges.