I had Mary Fabak in Chem 522 (in 1982), and she was strict but clear, kept her classes in order and made sure no stampedes took place when the bell rang. And no chewing gum in class, or else it would go on the forehead.
I had Biology and Chemistry with her in 86-87 & 88-89. She was clear, had high expectations and kept the class controlled. She never lost control herself.
Best science i had so far. She is the best. Mrs Fabak you rule!!!