speak as a teacher

He spoke as a teacher himself, his voice quiet.

Speaking as a teacher with thirty three year 11 kids in one class this is utterly ridiculous.

He spoke as a teacher to a gifted pupil.

But I, speaking as a teacher, tell you that I have no sympathy for you.

I spoke as a teacher, hard-edged and irascible, no lingering trace of softness.

Speaking as a teacher, many of the points that were raised, knowing your audience and identifying a main message, etc. really seem to me to apply to anything that one is trying to communicate.