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Thanks SoftSign.

That makes it very clear: преподаватель just doesn't have the separate accusative. It has to be -Я even if the person referred to is female.

However what happens when the noun...

Он наблюдает преподавателя

In this case the teacher is feminine. But am I correct in thinking that the animate masculine applies because the noun is masculine? I.e. the animate masculine rule is...