Educational Testing Service (ETS) is a non-profit organization that develops, administers, and scores more than 50 million tests annually in over 180 countries. ETS is best known for designing and administering the TOEFL and GRE tests, but it also offers a range of other assessments, including the Praxis series of teacher certification exams. ETS was founded in 1947 and is headquartered in Princeton, New Jersey.