A very old review from the mid to late '80s. But my memory of him is that he helped explain topics to you from a different angle than how you first approached it. An important way of thinking, in your formative years.
Used to yell and scream at students in anger, I remember hearing his voice echo down the halls in rage. Never felt comfortable with that.
Used to yell at students at the top of his lungs. Some anger management issues.
Based on when I had him in the 80's: He caused some stress. He definitely challenged you, which made you think even harder. He brought the best out.
paid more attention to those who understood what he was talking about rather than help the ones that needed it.