Office | Mineola, NY

About COLLINS GANN McCLOSKEY & BARRY PLLC

Nassau County's Premier Criminal Defense Attorneys.

Collins Gann McCloskey & Barry PLLC is a firm concentrating on state and federal criminal defense and also on dietary supplement law, with scores of major felony cases tried to verdict and thousands of clients successfully defended. The firm was founded by three former prosecutors now having more than sixty years collective experience in the practice of criminal law. The partners frequently lecture on trial practice and criminal law issues, serve as adjunct faculty at Hofstra University School of Law, and hold offices in numerous professional associations and criminal law organizations. Firm partners are admitted to practice before the New York, Pennsylvania, Massachusetts, Texas, District of Columbia and Maryland State courts, the Federal Courts of the Eastern and Southern Districts of New York and the Western District of Texas, the U.S. Court of Federal Claims, the U.S. Court of Appeals for the Federal Circuit, the U.S. Court of Appeals for the Second Circuit, the U.S. Court of Appeals for the Armed Services and the United States Supreme Court. Partner Richard D. Collins is a nationally recognized authority on the defense of sports drug cases. Partner Marc C. Gann specializes in the area of criminal defense litigation, handling a variety of criminal matters from misdemeanor offenses to serious felonies such as murder, robbery and assault. The firm has attained the highest rating available in Martindale-Hubbell.

 

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Reviews for COLLINS GANN McCLOSKEY & BARRY PLLC

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Overall Rating
Showing 1-10 of 76 client reviews from Lawyers.com
Lawyers.com Rating Snapshot
5 stars
97%
4 stars
3%
3 stars
0%
2 stars
0%
1 star
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What do people say on Lawyers.com?
Communication
5.0
Quality of Service
5.0
Responsiveness
5.0
Value for Money
5.0
Criminal Law
Posted by anonymous
December 06, 2017
Hired Attorney David Barry Esq.

Mr. Barry objectively and clearly laid out the legal elements and procedure regarding my particular case. I, along with my family, trusted Mr. Barry in representing me and ensuring that my case would be properly resolved in my favor.

Personal Injury
Posted by anonymous
August 11, 2017
Hired Attorney David Barry Esq.

Lawyers, nobody wants to have to need one but when you do I would highly recommend David Barry. He held my hand through out the whole process and was always willing to explain things in layman's terms to make sure I understood the process. Great guy with a great firm.

DUI/DWI
Posted by Catherine
October 09, 2025
Hired Attorney Marc Craig Gann

I worked with Marc and am very impressed and happy with results. He is very knowledgeable and personable. He guided me through the whole process, was easy to reach, and very responsive. Marc took the time to answer all my questions and explain everything to me. The rest of the team were great too. Highly recommend.

Parole and Probation
Posted by Philip
September 12, 2025
Hired Attorney Marc Craig Gann

I am so thankful that I retained the services of Marc Gann to handle my case. I had interviewed several lawyers to represent me and Marc Gann was by far the most personable and knowledgeable. As I worked with him I was always impressed by the depth of his knowledge and that he genuinely cared about me and my situation. Marc clearly explained everything to me at every stage of my case. Anytime I called his office my calls were promptly returned and Marc would take the time to patiently answer all my questions. I never felt rushed and I was always very satisfied with his responses. Considering his extensive expertise in law, I was amazed at how reasonable his fees were. I highly recommend Marc Gann for any legal issue that may occur in life.

 
Criminal Law
Posted by Steven
December 17, 2024
Hired Attorney David Barry Esq.

Could not recommend more! Everyone at this firm was extremely competent and professional kept me updated my original quote is what I paid not a penny more. And they won my case so I have nothing but great things to say.

Criminal Law
Posted by anonymous
December 06, 2024
Hired Attorney David Barry Esq.

I am incredibly grateful for the outstanding service received from Attorney David Barry @ Colins Gann McCloskey & Barry. From the very first consultation, they demonstrated exceptional professionalism and a deep understanding of the law. Attorney Barry took the time to explain every step of the process. ensuring we felt informed and comfortable throughout. I truly appreciated their responsiveness and willingness to address my concerns, no matter how small. Thanks for their expertise and dedication, our case had a successful outcome, and I couldn't be happier! I highly recommend Attorney David Barry at Collins Gann McCloskey & Barry to anyone seeking legal assistance. They genuinely care about their clients and work tirelessly to achieve the best results. Thank you for everything!

 
Criminal Law
Posted by Antonio
October 03, 2024
Hired Law Firm

My attorney, G. McCloskey from COLLINS GANN McCLOSKEY & BARRY law firm helped me immensely during a most difficult time. Facing a year in Jail is not what anyone wants on their horizon. Because of their attention to detail, knowledge of the law and legal talent, I won the case!. A huge burden was lifted. I cannot stress enough how they helped steer me out of legal trouble. I recommend the firm wholeheartedly.

 
Criminal Law
Posted by anonymous
May 26, 2024
Hired Attorney David Barry Esq.

I had a great experience working with this lawyer. They were very communicative throughout this process. They showed an unmatched professionalism and succeeded my expectations. Would highly recommend to anyone!

Personal Injury
Posted by Marian
July 13, 2023
Hired Attorney David Barry Esq.

This attorney came highly recommended. From the day I presented my case to David Barry, he was fully committed to helping us. He was professional, patient and answered any questions we had. I truly appreciate all that David Barry did to see that our case was handled with nothing but our best interests in mind. Thank you for everything!

Traffic Violations
Posted by William
January 12, 2023
Hired Attorney David Barry Esq.

Very knowledgeable and explained the entire process completely. I am very happy with the work and the ultimate solution. Would use David again in the future.

Services

Areas of Law

  • Criminal Law 41
    • Criminal Defense
    • Criminal Forfeiture
    • Criminal Investigation
    • Criminal Fraud
    • Burglary
    • Driving While Intoxicated
    • Electronic Surveillance
    • Extortion
    • Federal Criminal Law
    • Felonies
    • Forgery
    • Hit and Run
    • Homicide
    • Mail Fraud
    • Manslaughter
    • Money Laundering
    • Murder
    • Parole and Probation
    • Search and Seizure
    • Sex Crimes
    • Shoplifting
    • Stalking
    • Theft
    • Traffic Violations
    • Vehicular Homicide
    • Weapons Charges
    • Wire Fraud
    • Drugs and Narcotics
    • Drug Trafficking
    • Drug Forfeiture
    • Drug Crimes
    • Controlled Substances Law
    • Civil Drug Forfeiture
    • Anabolic Steroid Crimes
    • Larceny
    • Child Pornography
    • Criminal Mischief
    • Robbery
    • Internet Crimes
    • Vehicular Crimes
    • Computer Crime

  • White Collar Crime 1
    • Embezzlement
  • Assault 2
    • Assault and Battery
    • Sexual Assault
  • Sports Law 1
    • Sports Contracts
  • Intellectual Property 5
    • Trademarks
    • Trademark Registration
    • Trademark Protection
    • Trademark Licensing
    • Service Marks
  • Regulatory Law 1
    • Food, Drug and Cosmetic Law
  • Insurance 1
    • Arson and Insurance Fraud
  • Family Law 1
    • Child Welfare
  • Trusts and Estates 2
    • Guardian Ad Litem
    • Guardianship
  • Bankruptcy 1
    • Receiverships
  • Taxation 1
    • Tax Fraud
  • Identity Theft
  • Litigation 1
    • Diet Drug Litigation
  • Wills and Probate 1
    • Probate
  • Personal Injury
  • Commercial Law 1
    • Commercial Litigation
  • Other 9
    • Anabolic Steroids
    • DWAI
    • Dietary Supplement Law
    • Arson
    • Trespass
    • Public Lewdness
    • Resisting Arrest
    • Fraud
    • Conspiracy

Contact COLLINS GANN McCLOSKEY & BARRY PLLC

5.0
213 reviews

138 Mineola BoulevardMineola, NY 11501U.S.A.

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Fax: 516-294-0477
Office Hours:
  • Monday 9:00 AM - 5:30 PM
  • Tuesday 9:00 AM - 5:30 PM
  • Wednesday 9:00 AM - 5:30 PM
  • Thursday 9:00 AM - 5:30 PM
  • Friday 9:00 AM - 5:30 PM
  • Saturday By appointment
  • Sunday By appointment
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