great teacher. he was really helpful and was very approachable.
i think he is a really good teacher, liked his sense of humour, and appreciated his respect for all his students and he always did whatever he could to help
Probably the best teacher ever! Supports and greatly encourages his students. Thats Mr. O'Brien you made my high school worth it.
Is this "seasoned" old guy still teaching? Just kidding there old man, you were a great teacher. This class involved alot of work, Tom and his stories made it somewhat fun, I learned alot by the end.
Mr O'Brien is a very good teacher. He alwasy encourages everyone to do their best. He respects the students and expects it in return. One of the best teachers in the school!
O'Brians the best hands down, wants the students to do well and he makes sure they do.
good teacher....really wants us to do well...lame jokes tho..
One of the very best teachers and most enjoyable classes that I ever had.