About Attorney John F. O'Brien Attorney John F. O’Brien has over 30 years’ experience as a criminal defense lawyer. We’ve been protecting people’s rights in Hartford, CT since 1986. We have offices conveniently located across from the Manchester courthouse. However, we service a number of courthouses, including but not limited to, Bristol, Enfield, Hartford, New Britain, and Rockville. We also do jail and home visits. If you’re in need of a criminal defense lawyer, DUI attorney or a trial lawyer, don’t hesitate to give us a call.