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Brendan Michael Ahern

Personal injury Attorney at Islandia, NY

5.0   7 reviews
Free consultation Virtual consultation available
Free consultation Virtual consultation available
  • Licensed for 15 years
    State NY
    Acquired 2008
    Currently Registered No misconduct found

We have not found any instances of professional misconduct for this lawyer.

About Brendan

Learn Brendan’s areas of practice.


I am a former Executive Assistant District Attorney and Superivsor of the DA's Criminal Trial Division, as well as the former Bureau Chief of the Vehicular Crime Bureau, supervising all homicide and serious physical injury prosectuions on our roadways. Previously I served in a similar capacity in Nassau County supervising vehicular crimes across Nassau County. 


I am experienced in supervising and conducting complex, high-stakes investigations, litigation, and trials. I have been the lead trial attorney on numerous high-profile trials that have garnered significant national and regional attention, and have a track record of outstanding results, and excellence in the courtroom. It is my mission to fight fiercely for victims and victims families who have suffered personal injury or death. I fight for the voiceless in our criminal and civil systems of justice. 

I previously supervised hundreds of prosecutors and staff in the Trial Division of the Suffolk County DA’s Office as the Deputy Division Chief, including the Vehicular Crime Bureau, District Court, and the Domestic Violence Unit. I served as an executive advisor to the District Attorney on matters of policy, legislation, and strategy.

I hold the distinction of being the only attorney who served in a leadership position in both the Suffolk and Nassau County DA’s Vehicular Crime Bureaus, most recently serving as the Bureau Chief in Suffolk supervising all criminal investigations of motor vehicle and boating accidents in Suffolk County resulting in serious injury or death. Before that I served in a similar capacity in the Nassau DA’s Office.

I am trained in a variety of investigative techniques, forensic disciplines, and advanced trial advocacy skills related to accident investigations. I served as a statewide faculty instructor with the New York State Prosecutors Training Institute on topics such as Accident Investigation and Reconstruction, DWI Investigation, Advanced Trial Skills, Jury Selection, Communicating with Victims, and Legal Ethics. I taught related topics at the Nassau and Suffolk County Police Academies. Over my career I have lead and participated in the investigation of thousands of DWIs and accidents involving pedestrians, bicyclists, motorcyclists, cars, trucks, and commercial vehicles resulting in injury or death.

I have been recognized as a national and regional leader in the law. In 2021, I was invited to be a featured panel speaker on the topic of prosecutorial ethics at Hofstra Law’s Monroe H. Freedman Institute for the Study of Legal Ethics. In 2020, I was honored to be the recipient of the Robert M. Morgenthau Prosecutor of the Year Award from the the District Attorney Association of the State of NY. The award is given annually to one regional prosecutor that personifies a commitment to integrity and the tireless pursuit of justice. Also that year I was recognized by the National Highway Traffic Safety Administration as the National Prosecutor of the Year for my work in the area of traffic safety. In 2017 I was reconized for excellemce in my representation and legal advocacy in a high-profile murder trial that garnered national attention. 

Photos and videos

I secured this video within days of being retained by my client to protect her during a vehicular homicide investigation. The case resulted in a non-criminal outcome. 

Find out more by contacting me directly. (631) 231-1199 or
Testifying before the NYS Senate Transportation Committee regarding proposed legislation
Testifying before the NYS Senate Transportation Committee regarding proposed legislation
Testifying before the NYS Senate Transportation Committee regarding proposed legislation
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Rappaport, Glass, Levine & Zullo, LLP


5.0 / 5.0
  7 customer reviews
5 Star
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1 Star
Posted by anonymous | November 21, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Excelente profesional
I was involved in a fatal car accident, I was indicted with vehicular homicide, injuries, etc, after he review the case he knew that the case was going to be dropped because it was only a mere accident, not the way that it was portrayed by the District Attorney, after paperwork to be presented to the court and lots of patience, the case against me was totally dismissed
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Posted by Ramon | March 27, 2015
Great Attorney and Excellent Counselor
Mr. Brendan Ahern is one of the best attorneys I ever met in my life. I, as a lawyer, know specifically what it takes and what the profession requires to be successful and respected, and this person has everything a client looks for. This guy knows what it takes to bring an excellent service and to be consider one of the best attorneys in New York. His work ethic and his way of dealing with legal matters makes me more than ready to write this review. First of all I met him by recommendation from a good friend that told me this guy knows what it takes to deal with my legal situation. As soon as I met Mr. Ahern in his office in Long Island and he started to introduce himself and explain deeply my legal situation and what it takes to attack the charges against me by preparing a detailed legal action plan, I knew I was in good hands. From that moment I decided to request Mr. Ahern's services and everything went as I expected. From the first day I was in constant communication with Mr. Ahern. From the first moment this guy attended me personally and was up to explain everything with great detail, always writing me by e-mail or personally calling me and being always available to clear my doubts and answering my questions. He prepared a legal course of action that was very professional and kept me posted everytime he made an advance or the district attorney established a matter of law. His strategy was specific and effective at every moment and his advise was helpful all the time. He detailed everything and kept me under his plan everyday. He was always looking forward in case something happened and he always kept a second plan in case the main plan didn't work. His professional attitude and his deep knowledge of the New York State law made it easy for me to understand the process and to feel confident, I was in the best hands I could be. When I thought the worst was going to happen, going to trial, Mr. Ahern gave me the great notice that he made his deal and that we were up to have a deal with the district attorney. This movement made by Mr. Ahern was of great benefit for me and for my future, giving me a great opportunity to continue with my personal life and business-legal carrier without mayor consequences. He was of great help for me, my family and my loved ones. Keeping me out of trouble and having another opportunity to continue with my future plans, and at the same time saving a huge amount of money if I decided to trial my case. I owe this person a lot and if wasn't for him my life would be in danger at this moment. I recommend Mr. Ahern and every member of his team as a defense attorney and a trusted lawyer that knows what he has in his hands. This guy is one of the best I've ever see in my entire life and anyone who needs legal advise and representation can be sure that he will be in the best hands he could be. I thank Mr. Ahern to give me from his valuable time, treat me with professionalism and respect, and keeping me updated in every aspect this case demanded. Professionalism, great work ethic, amazing respect and knowledge of the law is what describes the job of this guy. I'm not waiting for more trouble to come in the future, but if something happens to me in the future Mr. Ahern will be my first and only option to deal with any legal matter I need. You are not going to find something like this in every corner of the State of New York, just a few people can offer what it takes to keep you out of trouble. And Mr. Ahern is one of the few that can bring you that confidence you need to take care of any legal situation that can change your life, your career, your family circle and your future. I thank you for everything you did and will be always thankful for you invaluable help.
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Posted by Anne | June 6, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Don't look any further! Brendan M. Ahern is the Best in the Business!
When it comes to Personal Injury not look any further Brendan Ahern! Thanks to Brendan and the firm, I just had a long awaited victory. Brendan's prep, attention to detail and his genuine care and concern resulted in a very quick and unanimous verdict! The jury members were very verbal about Brendan's talking points and reasonable summation being the reason they were able to bring about justice so effortlessly. Brendan spent so much time with me that he absorbed and relayed everything about the accident along with my pain and suffering on my day in court as if he was there beside me during the accident thru to trial! I had my day in court with confidence and assurance that I was in the best hands possible! Brendan M. Ahern did not disappoint!
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Posted by Noel | May 12, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Incredible Results!
At a time when our family needed help the most, we called Brendan Ahern for our legal needs. At our first meeting I was both impressed and relieved by his demeanor and knowledge of our particular situation. He walked us through the process, gave us meaningful feedback, and truly set our minds at ease. Brendan stayed in touch with us throughout the entire process and kept our expectations level every step of the way. Through his vast experience and bulldog tenacity, Mr. Ahern was able deliver an outcome far better than we could have imagined. I highly recommend retaining the services of Brendan Ahern.
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Posted by Thomas | May 8, 2023
This review is from a person who hired this attorney.
| Hired Attorney
I was referred to Brendan by a mutual friend after a motorcycle accident, and boy am I glad I decided to hire him as my attorney. Brendan kept me informed and explained everything that I was curious about, answered all my questions without hesitation in a very well spoken manner. He also guided me with my care following my injury which was greatly appreciated. He helped resolve my case in a timely manner with a very favorable result. I highly recommend Brendan to anyone as his expertise and experience in the legal system is unmatched!
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Posted by george | March 12, 2015
Brendan M Ahern
I live in NH, was traveling through NY on 6/28/14, totaled my car, and was arrested and charged with DUI/DWI. I became aware of and contacted Mr. Steven Epstein to handle my case. Mr. Ahern was ultimately assigned to my case and continued through its disposition on 2/18/15. I would whole heartily recommend Mr Ahern to anyone within the NY metro area. Mr. Ahern recently joined the firm of Barket, Marion, Epstein & Kearon, after serving several years in the NY DA's office. He has a wealth of knowledge of both sides. He knows first hand for example, what the DA can do, won't do, and due to legal constraints, can't possibly do in negotiating the best outcome for his client. (This information is crucial to you as a potential client.) I found Mr. Ahern to be knowledgable, and trustworthy. For example, I have been attending AA recovery meetings, he suggested I keep a record of those to show to the court my seriousness about recovery. He suggested that before the court orders it, I should have a LADAC evaluation, and attend a Phoenix House program, both of which I did. The best outcome for me was to have the case dismissed on some technicality, (areas that Mr. Ahern examined), however, I have to believe that following his advice, and reporting those successes helped in reaching an agreement to a less serious offense than charged. As this was my first, (and hopefully only), experience with the legal system I have nothing else to compare him to. Let's be real for a moment, Lawyering in our country is a lucrative business. The fees charged are astronomical. For someone making $15-20.00/hr. the cost of a defense can seem overwhelming. As it was to me. In order to provide a defense, Mr Ahern needed information from the DA's office. That information was painfully slow in revealing itself to our side. I unfortunately took some of that frustration out on Mr Arhen, but being the professional that he is, didn't take it personally. Throughout this process he has maintained a courteous, positive attitude. Again, I found Mr. Ahern to be a bright young attorney, who keeps his clients interests in the forefront.
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Posted by Pete | March 8, 2015
DWI Counsel
Brendan did a great job obtaining the best possible outcome for a recent DWI related case I was faced with. He reviewed our options during the initial consultation and advised me on pro-active measures I could take throughout the process, such as OASAS, character references and community service, to strengthen my case and ensure that I got through the ordeal without a criminal record or probation.
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  • Free Consultation 60 minutes
  • Retainer Always
Payment methods
Cash, Check, Credit Card


AVVO RATING 10.0 (Superb)

Work Experience

  • Trial Attorney
  • Rappaport, Glass, Levine & Zullo, LLP
  • 2022 - Present
  • Deputy Division Chief of the Trial Division
  • Suffolk County District Attorney
  • 2020 - 2022
  • Bureau Chief of the Vehicular Crime Bureau
  • Suffolk County District Attorney
  • 2018 - 2020
  • Partner
  • Reynolds, Caronia, Gianelli & La Pinta, PC
  • 2015 - 2018
  • Attorney
  • Barket, Epstein, Kearon & Marion, LLC
  • 2014 - 2015
  • Special Professor of Law
  • Hofstra University School Of Law
  • 2013 - 2013
  • Deputy Bureau Chief - DWI Prosecutions
  • Nassau County District Attorney's Office
  • 2013 - 2014
  • STOP-DWI Supervisor
  • Nassau County District Attorney's Office
  • 2011 - 2013
  • Senior Trial Assistant - Vehicular Crimes Bureau
  • Nassau County District Attorney's Office
  • 2008 - 2014
  • Assistant District Attorney - DWI Section
  • Nassau County District Attorney's Office
  • 2007 - 2008
View all work experience


  • Hofstra University School of Law
  • JD - Juris Doctor
  • 2007
  • Villanova University
  • BA - Bachelor of Arts
  • 2001

Sample of Legal Cases

  • People of the State of New York v. G.P.
  • Dismissal
  • People of the State of New York v. L.S.
  • Sealed Disorderly Conduct (violation)
  • People of the State of New York v. KM
  • Non-criminal
View all legal cases


  • United States District Court for the Eastern District of New York
  • Admitted
  • 2015 - Present
  • American Institute of DUI/DWI Attorneys
  • Member
  • 2015 - Present
  • Suffolk County Assigned Defender Plan - Homicide Panel
  • Member
  • 2015 - Present
  • Brehon Law Society of Nassau County
  • Member
  • 2015 - Present
  • National College of DUI Defense
  • General Member
  • 2014 - Present
  • Criminal Courts Bar Association of Nassau County
  • Member
  • 2014 - Present
  • Brehon Law Society of Hofstra University
  • President
  • 2005 - 2007
View all associations

Languages Spoken

  • English
  • Japanese

Honors and Awards

  • Top 10 DUI/DWI Attroneys in New York State
  • American Institute of DUI/DWI Attorneys
  • 2015
  • Top 10 Under 40
  • National Academy of Criminal Defense Attorneys
  • 2015
  • Executive Citation
  • Nassau County Police Department Homicide Squad
  • 2013
  • Citation for Excellence
  • Nassau County Executive Edward Mangano
  • 2011
  • Meritorious Service
  • Mothers Against Drunk Driving
  • 2011
  • Judge Edward Hart Scholarship for Excellence in Trial Advocacy
  • Hofstra University School of Law
  • 2007
View all awards


  • Prosecutors Encyclopedia - New York Prosecutor's Training Institute
  • Opening and Closing Statements in DWI Cases
  • 2012

Speaking Engagements

  • Suffolk County Criminal Bar Association CLE
  • Accident Investigation & Reconstruction: DWI to Vehicular Homicide
  • 2016
  • CLE
  • Accident Investigation & Reconstruction
  • 2015
  • 2012 DWI Training for Police & Prosecutors: DWI and DWAI Cases: Real Problems and Solutions
  • Opening Statements in DWI and DWAI Cases
  • 2013
  • 2012 DWI Trial Advocacy
  • Openings & Closing Statements in DWI Cases
  • 2012
View all speaking engagements

Attorney endorsements

Received (10)
Given (10)
Endorse Brendan
DUI and DWI Attorney | Aug 04
Relationship: Worked together on matter
"Brendan is a master of criminal defense and DWI matters. His skill and ability are unmatched. He is a tremendous advocate and is unstoppable in front of a jury. I endorse this lawyer."
DUI and DWI Attorney | May 19
Relationship: Fellow lawyer in community
"Brendan is a highly skilled and intelligent attorney. I have tried a vehicular homicide against him when he was a prosecutor and as a private attorney we have worked together protecting the rights of those accused. Brendan is one of the most skilled and hard working attorneys I know."
Criminal defense Attorney | Dec 03
Relationship: Fellow lawyer in community
"Brendan is an experienced professional committed to fighting for his client's rights."
DUI and DWI Attorney | Oct 29
Relationship: Fellow lawyer in community
"Brendan is one of the most knowledgeable and skilled DWI attorneys in the area. I worked with him at the District Attorney's Office where he was responsible for handling the county's most serious DWI cases including ones involving Vehicular Assault and Homicide. I strongly endorse Brendan to handle DWI and all criminal cases."
Criminal defense Attorney | Sep 16
Relationship: Fellow lawyer in community
"Brendan is a former prosecutor that uses his years of experience to deliver a high quality defense. I've been his adversary as opposing counsel and have gone to him for advice once he was a defense attorney. I highly recommend him."
Criminal defense Attorney | Jul 14
Relationship: Fellow lawyer in community
"Brendan Ahern is a top-notch criminal defense lawyer. He is extremely knowledgeable and highly ethical. I had the pleasure of working with him at the District Attorney's Office where he was entrusted to handle high profile homicide and vehicular homicide cases. His expertise in the area of DWI defense is unmatched by many in the industry. I fully endorse him for any client seeking criminal representation."
Criminal defense Attorney | Mar 27
Relationship: Fellow lawyer in community
"I had the pleasure of working with Brendan as a prosecutor in the Nassau County District Attorney's Office for over two years. Brendan has a stellar reputation for his knowledge of trial practice. But what separates Brendan from most practitioners is his ability to handle the most important cases for his office and deliver results in the courtroom time and time again. I highly recommend Brendan for any criminal case."
Criminal defense Attorney | Feb 25
Relationship: Worked together on matter
"I had the pleasure of working with Brendan as a prosecutor in the Nassau County District Attorney's Office Vehicular Crimes Bureau, where I personally observed him prosecute several of the most serious vehicular homicides in the county at the time. Brendan is smart, honest and a skilled litigator who uses his experience to get the best possible results for his clients. I hightly recommend Brendan."
DUI and DWI Attorney | Sep 30
Relationship: Opposing Counsel on matter
"Brendan and I tried a case against each other, and he exhibited a high level of integrity and professionalism prior to, during and after the trial. He also demonstrated an extensive knowledge of the law regarding DWI cases. I fully endorse him as an attorney."
DUI and DWI Attorney | Aug 25
Relationship: Opposing Counsel on matter
"Brendan Ahern is exceptionally regarded in the legal community. He is an extremely knowledgeable, ethical and excellent trial attorney. I can, without any reservation, profoundly endorse him."
View more endorsements
Criminal defense
Criminal defense
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Admiralty and maritime
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Criminal defense
Islandia Personal injury Lawyer Brendan Michael Ahern
Brendan Michael Ahern
Personal injury Attorney
Islandia, NY
Licensed for 15 years
Free Consultation
Virtual consultation available