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Who is eligible?
Recent college graduates are what most independent schools are looking for. The appointments usually are for one year and are full-time positions. Schools look for young men and women who have a degree in a specific subject area and can make a meaningful contribution to the life of the school and who are passionate about their subject.
You get to teach under the watchful eye of a mentor assigned to you. If you are in a boarding school (most internships seem to be at boarding schools for whatever reasons) you will also be assigned a dorm in which to live where you will act as a residential advisor or counselor. A permanent member of staff will have overall responsibility for the dormitory in which you will be living. You will also be expected to coach a sport or perhaps supervise an extracurricular activity.
Why go this route?
The most compelling reason has to be the reality that you will get to teach the subject you love to young people who want to learn. Better yet, because of the strict codes of honor independent schools have in place you won't have to worry about dealing with a class full of unruly teens. They want to excel just like you did. Another advantage to interning in an