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 - 1 of 1 review | Criminal Defense

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

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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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This attorney hasn't created any attorney endorsements recently on Avvo.

Experience

Rating:  7.8 (Very Good)

Education

1995

Fordham University School of Law

JD - Juris Doctor

Avvo Rating

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Avvo Rating Levels
10.0 - 9.0 Superb8.9 - 8.0 Excellent7.9 - 7.0 Very Good6.9 - 6.0 Good5.9 - 5.0 Average4.9 - 4.0 Concern3.9 - 3.0 Caution2.9 - 2.0 Strong Caution1.9 - 1.0 Extreme Caution