Professor Barreto is wicked smart, but seems aloof. He doesn't engage with students, and seems almost bothered by questions. The subject matter is something I'm passionate about, and I learned a lot from him and Professor Dunn who co-taught the course with him - but unless someone is independently interested in the subject, his disengagement with the students would likely make it a miserable course for most. In short, lectures are great, engagement with students is poor - so consider that when thinking of taking a class with Professor Baretto.