ELS Educational Services is a private entity that provides English language training in the United States. It operates through various language centers, often based on a college campus. Originally set up as an organization for creating and publishing ESL materials, ELS opened its first center in 1961 and shortly thereafter began to focus on teaching. It became a fully owned subsidiary of Berlitz Languages Inc., a part of Berlitz International Inc., in 1997. ELS is headquartered in Princeton, New Jersey. It has been accredited by ACCET (Accrediting Council for Continuing Education and Training).