My high school Spanish teacher, Mr. McGregor. He was funny, intense (he was also the football coach), he took his job seriously yet also had a sense of humor. He made it very clear that he cared about the subject matter, and us. He spent a year in Guadalajara, Mexico, immersed in the culture and language. He wanted us to learn and would walk out of the room to cool down when it seemed clear we hadn’t done our homework.
He drove an MG Midget. I never had another teacher who came close to his passion for his work.
Looking back, it was an interesting dynamic: he was demanding, but no one seemed to mind. I wouldn’t be surprised to learn that he burned out and left the profession prematurely.