Founded in 1919, the American Classical League (ACL) is a professional organization which promotes the study of classical civilization at all levels of education in the United States and Canada. Teachers of Latin, Ancient Greek and the Classics account for the majority of its membership, though the ACL is open to any person interested in preserving the language, literature and culture of both Ancient Rome and Ancient Greece. Currently based in Miami University in Oxford, Ohio, the league publishes and provides hundreds of teaching aids; runs a national placement service for teachers of Latin and Greek; sponsors the National Latin Examination (NLE); functions as the parent organization of both the National Junior Classical League (NJCL) and National Senior Classical League (NSCL); and annually holds a convention — the Annual Institute — to promote excellence in the teaching of classical studies.