Dennis Brendan O'sullivan

Dennis Brendan O'sullivan

5.0
Rating: 7.8

Licensed for 27 years

Transportation Lawyer at Jamaica, NY
Practice Areas: Transportation, Speeding & Traffic Ticket, Criminal Defense, Environmental and Natural Resources

14811 175th St Ste 2, Jamaica, NY

About Dennis

Biography

Practice Areas

4

Practice Areas

Transportation 50%

The Law Office of Dennis O'Sullivan represents commercial vehicles in all courts in New York State. We specialize in overweight violations, equipment summonses, driver citations, criminal offenses, and environmental and administrative hearings.

26 years

50%
Speeding and Traffic Ticket 30%

The Law Ofice of Dennis O'Sullivan represents motorists in all New York State courts, including Traffic Violations Bureau hearings and local courts.

26 years

30%
Criminal Defense 15%

DWI Defense; DWAI Defense; Driving with a Suspended License; Suspended Registrations; Leaving the scene of an accident; reckless driving

26 years

15%
Environmental and Natural Resources 5%

The Law Office of Dennis O'Sullivan defends individuals and businesses in NYS Department of Environmental Conservation administrative proceedings.

26 years

5%

Fees and Rates

We have not found any cost information for this lawyer


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Licenses

Licensed in New York for 27 years

State: New York

Acquired: 1999

Currently Registered

No misconduct found

Location

Law Offices of Dennis Brendan O'sullivan

14811 175th St Ste 2, Jamaica, NY, 11434-5524

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Dennis Brendan O'sullivan's Reviews

Avvo Review Score

5.0 /5.0

5 Client Reviews

Filter Avvo Reviews (5) Refine reviews to match your needs. Use the filters to quickly surface reviews that align with your case or priorities.
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Practice Areas

Showing 1 - 5 of 5 reviews

Posted by Bijan | September 16, 2026 | Hired Attorney

**Exceptional Attorney—Professional, Reassuring, and Truly Dedicated**

Dear Dennis, I want to sincerely thank you for everything you did for me. I was referred to you by Andrea Casellas, who has always been wonderful in helping me, my friends, and family with tickets. When I needed an attorney for a misdemeanor/criminal matter, she immediately recommended you—and I a...m very grateful she did. From our very first conversation, you were professional, knowledgeable, and reassuring. I was genuinely scared and overwhelmed by the situation, but you took the time to explain every step of the process clearly and honestly. You told me what to expect at the police department, what would happen afterward, and how the court appearances would work. Everything happened exactly as you explained, which gave me a lot of peace of mind during a stressful time. You handled my case with care and professionalism from beginning to end. You also understood how concerned I was about having an open case appear on my background check and the impact that could have on finding work. You reassured me that you would work to get it resolved, and you followed through. In the end, the case was dismissed, I received only a violation and a $120 fine, and there are no criminal charges on my record. I truly appreciate your hard work, honesty, and support throughout the entire process. It is difficult to know who to trust when dealing with the court system, especially when so much is at stake. You did exactly what you said you would do from day one, and the outcome was better than I could have hoped for. Thank you again, Dennis. I would gladly recommend you to anyone who needs a skilled, trustworthy, and compassionate attorney. Sincerely, Bijan Emami

Posted by Mike | July 22, 2025

The Man is HONEST!

Dennis is an Amazing, Honest, Stand Up Guy! I met him 8 years ago in traffic court when I took my son to fight his ticket. Dennis told us because my son has only been driving a few years and has never had a ticket before it would get knocked down to a parking ticket. And thats exactly what happe...ned. No points but, a $200 fine. He learned his lesson. 10 months ago wife's parked car received a $300 ticket for a expired registration. So I mailed it in to fight it and it took 10 months to get a hearing date. Now the fine was $955! And to top it off I was going to be out of the country for the date I was to show up. I tried calling to get a new date, but nobody answered the phone. I called a few lawyers in my area, Suffolk County, and they wanted hundreds. So I remembered I had met Dennis and found his business card in my desk draw. Gave him a call and he said he could take care of it for 1/3 the cost that others wanted. He also told me you can just walk into traffic court without an appointment. Unlike what other lawyers had told me. Today I walked in and my fine was drastically reduced. Thank you Dennis for being AWESOME! You could have lied like the others and took my money, but you didn't, because you are honest. nyticketdefense.com

Posted by Tysaun | March 31, 2021 | Hired Attorney

Highly Recommended Lawyer

Got referred to Mr. O’ Sullivan by another great lawyer , once I reached out to him he told me that he would happily take care of my traffic infractions. When our court date was approaching he didn’t guarantee me anything but he was confident that we would come out of court with an awesome deal and o...n the day of court did. He got an unlicensed operator ticket and another ticket I had that was worth 4 points on my licensed both dropped down to 3 J walking tickets with low fines and no points so I was beyond happy and he is highly recommended for his professionalism all across the board

Posted by Chris | August 21, 2018 | Hired Attorney

Ticket dismissed!

Mr. O'Sullivan did a great job for me and had a very reasonable fee. I had a speeding ticket in NYC worth 6 points and he was a tremendous help. He is friendly, professional, and knowledgeable. He was very on top of assisting me through the process and was very responsive to my questions and concerns.... Overall a great experience with a good outcome!

Posted by Abe | February 18, 2014

Excellent Attorney!

I have hired Dennis on more than one occasion for some serious traffic speeding violations both in the city and upstate. He did a phenomenal job in getting my point lowered to practically O or very close. He really goes the extra mile and is a very seasoned attorney.

See All Client Reviews

Dennis Brendan O'sullivan's Lawyer Endorsements

Endorse Dennis
Patricia K. Scanlon headshot
Patricia Scanlon

Criminal defense lawyer | Mar 13

Relationship: Worked together on matter

"I endorse this lawyer. Dennis O'Sullivan is honest and diligent and a genuinely good person who works hard to get the best results for his clients."

Paul M. Villanueva headshot
Paul Villanueva

Unknown lawyer | Aug 16

Relationship: Fellow lawyer in community

"I endorse this lawyer."

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Experience

Rating:  7.8 (Very Good)

Education

1995

Fordham University School of Law

JD - Juris Doctor

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