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also known as A.B.A. Advanced Legal Services
An Experienced Connecticut Defense Attorney at Law and Retired Army Officer
When you enlist the help of Attorney John F. O'Brien, you'll receive dependable legal representation from a knowledgeable attorney with a history of success.
I have over 35 years of experience as an effective criminal and DUI defense lawyer. I proudly represent clients across Connecticut, especially in Hartford, New Britain, Manchester, Rockville, and Torrington. We also do jail and home visits.
If you’re in need of a criminal defense lawyer, DUI attorney, trial lawyer, or personal injury lawyer, contact me today. I’d be happy to discuss your case with you.
I am available to handle your legal emergencies 24 hours a day, seven days a week. If you or your loved one is arrested for a DUI or needs a criminal defense attorney, I can help. Call me today and get the representation you need and deserve. I promise to fight for your rights.
I promise you straight answers you can understand, practical advice you can follow, honest fees you can afford, and aggressive representation you can count on.
Our Legal Services
Arraignments and bail reductions
Attempt and conspiracy cases
Computer crimes
Domestic violence cases
Drug abuse and sale cases
DUI/DWI cases at court and the DMV
Firearms and explosives cases
Larceny and fraud cases
Sex misconduct cases
All motor vehicle violations
Pre-arrest services
Sentence reduction proceedings
Criminal appeals and pardons
Probation violations
Affordable, Convenient Legal Representation
24/7 emergency service, including nights and weekends
Free consultations and advice
Fair fees and payment plans
Special “Pay as You Go” fee plans
Special rates for first offenders, students, veterans, and union members
Free Legal Consultations and Advice
24/7 Service — Available Nights and Weekends
Special Rates for First Offenders, Students, Veterans, and Union Members
10% Legal Discount
10% Discount for Veterans, Students, and Pre-Payment Clients When You Mention Promo Code “10 OFF“
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Practice Areas
We have not found any cost information for this lawyer
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Chat withState: Connecticut
Acquired: 1986
Lawyer disciplined by state licensing authority in 2025
15 Park Street, Rockville, CT, 06066
Showing 1 - 5 of 7 client reviews from Avvo
Posted by anonymous | December 14, 2023 | Hired Attorney
Hello. I had Jon O’Brien out of Rockville, CT as an attorney for a matter that DID NOT HAPPEN. The girls filed a false police report , AND DESTROYED THE VIDEO EVIDENCE THAT PROVED MY INNOCENCE. Well!!! NOTHING. Was done. JON, after 2 YEARS OF CONTINUING THE CASE , JON SAID MY ONLY OPTION WAS TO TAKE ...
Posted by Robert | August 18, 2022 | Hired Attorney
I found myself jammed up over a matter whereas a unusual series of events unfolded brining with it a breach of peace charge which on its own wouldn’t have been a huge concern to attempt to resolve on my own. However in my personal reality such breach of the peace domino effect triggering a violatio...
Posted by Brittany | July 2, 2022 | Hired Attorney
John has been my representation more than a dozen times between , myself, family, friends and colleagues. He has been our attorney for criminal , motor vehicle, accident cases and just plain messes! John will treat you like family, answer the phone , explain better than any teacher and deliver on hi...
Posted by January | March 19, 2022 | Hired Attorney
Attorney O'brien is not only an outstanding lawyer but he also builds a relationship with his clients. He made my Husband and I feel like we were family. With His hard work and determination he was able to get my Husband a reduced sentence. Attorney O'Brian prices are very affordable for any budget....
Posted by anonymous | June 4, 2021 | Consulted Attorney
Extremely nice, friendly, and helpful! I consulted with Attorney O'Brien over a legal matter. He met with me for close to an hour. Although he quoted a reasonable price if I needed to hire him, he provided me with all the information I needed to take care of my legal issues on my own successfully. I...
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This lawyer was disciplined by a state licensing authority in 2025.
Conditions issued in CT, 2025
updated on 11/11/2025A condition is a disciplinary order from the Statewide Grievance Committee that an attorney fulfill a condition within a certain time frame. If the attorney does not fulfill a condition in a timely manner, the Superior Court may also impose any condition necessary to protect the public.
Conditions issued in CT, 2023
updated on 10/03/2023A condition is a disciplinary order from the Statewide Grievance Committee that an attorney fulfill a condition within a certain time frame. If the attorney does not fulfill a condition in a timely manner, the Superior Court may also impose any condition necessary to protect the public.
Reprimand issued in CT, 2005
updated on 02/03/2009A reprimand is an order from the Statewide Grievance Committee after it has found that an attorney has engaged in ethical misconduct. If an attorney receives more than 3 reprimands in 5 years, a presentment must be filed against the attorney so the Superior Court can decide if more serious discipline should be ordered.
Conditions issued in CT, 2003
updated on 09/19/2014A condition is a disciplinary order from the Statewide Grievance Committee that an attorney fulfill a condition within a certain time frame. If the attorney does not fulfill a condition in a timely manner, the Superior Court may also impose any condition necessary to protect the public.
2025
Distinguished, Martindale-Hubbell
2024
Distinguished, Martindale-Hubbell
2023
Distinguished, Martindale-Hubbell
2022
Distinguished, Martindale-Hubbell
2021
Distinguished, Martindale-Hubbell
2020
Rising Star, Super Lawyers
2020
Peer Review Rated, Martindale-Hubbell
2019
Distinguished, Martindale-Hubbell
2019
Peer Review Rated, Martindale-Hubbell
2019
Rising Star, Super Lawyers
2018
Rising Star, Super Lawyers
1975 - 1996
Retired Major, US Army Intelligence Officer
1990 - Present
National Association of Criminal Defense AttorneysMember
1986
JD - Juris Doctor
1977
MA - Masters
1975
BA - Bachelor of Arts
Spanish