The lernu! project is financially supported by the American research foundation "Esperantic Studies Foundation", ESF. The team which created this website is a part of the international organization Education@Interreto, E@I.
ESF was founded in 1968 by Humphrey Tonkin, Jonathan Pool, and E. James Lieberman, to support and stimulate the growth of English-language technical literature on Esperanto. Little by little, the use of Esperanto in education became one of the foundation's primary focuses, due in part to its affiliation with the North American Summer Esperanto Courses, NASK, which it supports financially and helps organize.