He is openly belligerent when dealing with students, especially when one is asking a legitimate question. Really not something you want to see in a teacher.
One of the best teachers I have EVER had. I didn't even like math before Mr. Katz and twenty years later I graduated with a BS in math and went into finance.
Donald Katz is one of the best teachers I have ever had
Only teacher to ever teach Math and make it actually fun
Single greatest teacher I have ever had. He will grind Calculus into your head before the end of the year.
Likes to teach and it shows. Has a great attitude and the subject matter's never boring.