The Esperantic Studies Foundation is a foundation which strives to solve international language problems. According to its website "The Esperantic Studies Foundation promotes research and teaching on Esperanto and on related issues of interlingual communication, especially in the context of higher education in North America."
One of ESF's educational projects is lernu!, a website hosting several free multilanguage courses designed to teach Esperanto. The site was launched December 21, 2002. The word lernu is Esperanto for "learn", in the jussive mood.
ESF's current president is Humphrey Tonkin.