While authorities investigated, teachers and students huddled together in locked rooms, said Marianna Sviland, a teacher at the college who was in a faculty workroom at the time of the stabbing.

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Ms. Isaacson will not be able to receive tenure because of her low score despite the fact that she is considered by students, faculty and administration to be an excellent teacher.

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"Olga is a very natural and gifted teacher, hard-working and extremely devoted to her students, " the school's artistic director and faculty chairman, Peter Martins, said in an e-mail.

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