The American School in Japan, one of Tokyo's most prestigious international schools, has revealed that teacher Jack Moyer, a renowned marine biologist, sexually abused students while employed by the institution between 1963 and 2000.

School executives made the admission to alumni in an email sent out Monday. However, numerous former staff and students allege that ASIJ administrators had been aware of the molestations for decades — and failed to act on victims' complaints.

Moyer committed suicide in Tokyo in 2004.