Professor Dey is a solid lecturer, I just got absolutely devastated by his exams. Mass transfer is a difficult class and he does a good job of being accessible for office hours outside of class, so go to those if you want to survive the class with a desire to continue the ChemE degree.

He lectures by following the textbook. His tests are pretty straightforward as well.

Dey lectures using examples from the textbook, but unlike the textbook his explanations are thorough and easy to follow. I also appreciated how neat and well-written his notes were. Homework assignments were short. Two midterms and one final, with inconsistent difficulties. I look forward to taking him again in 120C.

Tough grader. Won't take his class anymore.

Very nice and helpful professor. Studying the textbook really well is essential to pass the exams.

Lectures are just verbatim from the book (which is horrible itself and deserves a 1/5 on it's own regard) and no conceptual understanding of the material is a part of the instruction. I wish I could retake this class with another professor because I'm afraid that I don't actually understand the material (nor does anyone else).