I think that Mr. O'Brien, could very well be not only the coolest but the best teacher in the school! He is not only smart and skilled, but caring and considerate...
OB rules!!!! by far the best teacher ever at holy... green means go!!!
A good teacher, but takes way to long to mark things.
One of the few teachers who actually care about their students and their success
Definitly one of my favorite teachers..one of those teachers that definitly has a good impact on the student ..
Mr. OBrien is funny, nice, and fair-- the perfect qualities for a teacher... he's just a little hard
Awesome teacher. Very fun and treats everyone with respect!
He is an awesome teacher who helps and gives students various opprotunities.
O'Brien is one of the most helpful and FUN teachers at holy!