Professor Hansen was a really sweet guy. Unfortunately, because I took this class during the pandemic, he had his classes set up in a really strange format. He would pre-record each lecture, then play the video for us during class time, then go over everything again in person. Personally, I found the format pretty useless. However, he was a nice guy and was pretty helpful, s I imagine that his class would be a lot better in person. Also, he doesn't require a textbook and has his own notes that he makes available to you instead of making you buy a book, which means the class and "book" are essentially the same which is super helpful