This comment concerns Kevin Parrish, who substituted for my class a couple of times. It was evident that he really wanted to impart as much knowledge as possible to help us, and he did so in an effective and engaging manner. The content he teaches is fantastic, and he discussed topics in great depth, some of which couldn't be found in the books, so his insights were invaluable in that regard as well. Additionally, I had a few remaining questions after the course ended, and he replied with paragraph explanations very promptly, something I really appreciated. Mr. Parrish is great!