The teacher who I remember with love and respect to this day was one Mr. E who taught at the elementary school I attended. He had such a dignity and gravitas. I don't recall ever seeing him smile, nor did he ever raise his voice in anger, yet he commanded universal obedience and respect, not out of fear of him, but out of love and a fear of disappointing him.
Here's what I mean: One day some kids were running around in the hall goofing off. A visiting parent was there and told them to stop. The kids ignored her. She says, "I'll tell your teacher." they keep running and yelling. "I'll tell the principal." Nothing, they keep playing. "I'll tell Mr. E." snap! As though a switch were thrown the kids immediately stop running and shouting, straighten up (literally), and transform into little angels. Mr E wasn't even anywhere around. The invocation of his name alone was enough to remind the kids to behave properly.
Decades later, I've still never met anyone like him. I hear he's retired, gone into farming, and still visits the school from time to time.