Just the best. He's clear on expectations, responds to student's discussion form questions quick, and hes pretty funny. Im in Chem 109C rn, and my only complaint is that he goes pretty fast, but I think its because he wants to give us more time to review. Definitely a difficult class!!! You gotta study on your own but Lewis is there for you.

Great professor - taught from the textbook but in a way that is easier to understand. Gives you a clear pathway to succeed if you follow his advice and read the textbook before lectures and do every single possible problem.

great explainer, highly reccomend for 109a, practice and textbook is key

Lectures are good, tests are hard - it is Ochem. One complaint I have is that Lewis did not point out that he had an entire module on canvas full of review materials and games etc., and my test scores greatly improved after finding that. If you put in extra work more than a week before exams, you will succeed. Lectures were well paced and engaging.

Great teacher. Just showing up to lecture isn't enough. I don't usually touch textbooks, but in this class the textbook/book problems are your bible. This isn't a suggestion, it's a prescription, unless you want to implode ;P

best chem professor at ucsb. makes everything so clear and explains in multiple ways, takes notes with you to make it clear what you need to know, tests are straightforward. final was a little harder but overall way better than gen chem