Very interesting topic Scott
Let's see, what teachers did I leave the biggest impact on..
hmmm, we'll come back to that later..
I was lucky to have several teacher's that all had some amazing qualities as far as their teaching skill and keeping you interested. I would say the best mix was in high school where I had a Professor Katz, whom I hated; and a Mr Arcolio who was my hero. Sometimes it's all about the teachers style. This school was an all boys school, so we did have several rowdy inmates :P
My first go around with Prof Katz for the final year of French was a nightmare. He was past retirement age, and an antiquity in his own right. I still wonder if his family came over on the Mayflower. The first day spoke volumes about him. It was normal on the first day of class to assign books, get a seating chart and perhaps discuss the curriculum for the rest of the year. Not Prof katz... he handed out our books and we started an assignment that day. We also had a homework assignment reading 2 short stories about 15 pages and having to answer the questions at the end of each. Well I think I attended his class maybe 1/2 the time. All of our classes had 2 doors, front and back. I would check in the front and make sure he saw me, and duck out the back first chance I had. Needless to say I failed that class.
Now Mr Arcolio on the other hand was a much younger teacher and knew how to handle a rowdy class. Although he rarely spoke English in class, everyday would start off he same way. He would start talking about either TV, or a sports game all in French. By keeping it topical he had everyone's attention. He also promised that so long as you showed up a few times a week you would pass, show up daily and you will get at least a 90

This was also the final class before the State Regents, so 1/2 way through the term he pulled out old regents and taught us how to understand and take shortcuts. Je suis allé à la plage.. I went to the beach. He taught us how to answer short and simple to a variety of questions. He always said that you get no credit for long and wrong sentences.. Made sense to me...