The Academy of Art University is a private art and design school based in San Francisco, USA. It was established in 1929 by the artist Richard S Stephens. Both on-campus courses and online courses are offered, for under-graduate, graduate, continuing education, and pre-college (high school) students. Subject areas include animation, computer arts, fine art, graphic design, illustration, and photography.
The Academy of Art University's website is at www.academyart.edu. Browsing the course catalog will give you an idea of what wide range of art courses you could do, but remember it's a private college so tuition is not cheap.