JD for the role of Principal at Harrow International School, New York. 4.0 Principal's Duties. 4.1 Duties: The Principal will be responsible for developing an innovative academic curriculum and. an inclusive learning culture at the School. The specifics of the Principal's duties are outlined below. 4.1.1 Lead the School through its pre-launch, launch, growth and development. 4.1.2 Be responsible for the day-to-day management of the School, its fa...