graduate degree. More than 1,700 were Harvard employees using the Tuition Assistance Program, and an estimated 10–15% were exclusively online students. Of the 255 Certificate of Special Studies graduates that year, 163 were international students hailing from 39 countries. In the early 2000s, there were 208 students under the age of 18. Most attended local high schools, but a growing number were home-schooled. The Extension School now requires that a high school diploma or its equivalent is earned at least five years prior to enrolling in any courses applicable to its undergraduate degree. Harvard Extension School enrolls about 4,000 international students each year. To be admitted to courses or degrees, a student must prove proficiency in the English language. If English is not a student's native language, then he or she must submit an official TOEFL or IELTS score with a minimum score of 100 for the TOEFL or a minimum score of 7.0 for the IELTS. International students, like American students, must meet the on-campus-only course requirements to earn a degree. The Extension School does not issue I-20s for the F-1 visa but the Summer School does. In 2013, students came from 118 countries and 46 states. Notable people The school has many notable alumni including politicians and celebrities. Alumni Faculty Notes References Further reading External links 1910 establishments in Massachusetts