The Puerto Rico Teachers of English to Speakers of Other Languages, Inc. (PRTESOL) is an independent professional organization founded in 1966. The organization was created out of professional concern over the lack of a single, all-inclusive professional organization that could bring together teachers and administrators at all educational levels with an interest in teaching English to speakers of other languages; also known as ESOL in the early days prior to the foundation of TESOL as a field, profession, and/or organization.