Divorce and family lawyers for Long Island
Big enough to fight, small enough to care.
Serving Nassau, Suffolk and Queens since 2003

As featured in
Focused only on divorce and family law
The Law Offices of Seidner & Associates, PC has a staff of attorneys and paralegals who focus only on these two areas of law, with a combined roughly five decades worth of legal experience in our Garden City office.
We are big enough to have the capacity to handle the most complex legal matters yet small enough to have intimate relationships with all of our clients.
About the firm
Our practice areas
We handle a wide range of divorce and family law matters for clients across Long Island and Queens.
Why clients choose us
The lawyer and client relationship is just that: a relationship. These are the commitments we make to every client.
At your side, every step of the way
We are with you at every twist and turn, providing guidance and support, so you never feel lost in Long Island’s legal system.
Dedication to fight for your rights
When we take on your case, your fight becomes our fight. We stay determined to protect your rights and leave no stone unturned.
Solutions tailored to your needs
We know every contested or uncontested divorce case is unique. We craft personalized legal strategies, designed to fit your specific needs and circumstances.
A results-driven approach
Whether it is a high-conflict divorce, high net worth asset division, child support, spousal support, or another family law matter, our focus is always on the finish line.

Can't afford a lawyer? You may not have to pay your own fees.
If your spouse has more money than you do, a New York court can order them to pay toward your attorney's fees while the case is pending. The law presumes the less-monied spouse is entitled to that help, so call us for an evaluation even if you think you can't afford representation.
Attorney advertising. Outcomes depend on the facts of each case.

Matthew S. Seidner, Esq.
Founder & Principal Attorney
Matthew founded the firm in 2003. Clients describe a lawyer who explains every option, stays reachable, and is as ready to negotiate as he is to go to trial.
- Adjunct Professor of Law at Hofstra
- Nassau County Bar Association Matrimonial Law Committee
- Nassau County Grievance Committee
- Published in the ABA's Law Practice Magazine
- Formerly at Quinn Emanuel and Fitzpatrick Cella
Professional organizations: New York State Bar Association, Nassau County Bar Association, American Bar Association
Read Matthew's full bioResults for our clients
Real cases from the firm's own case notes, and the moment each one turned.
Relocation2013
At the courthouse door, the father settled.
Laid off, living with her parents and owed thousands in child support, our client asked to move to Florida with her three children. The father fought it for months. As Mr. Seidner was about to give his opening statement, the father agreed to settle, and the talks ran late into the night.
The outcome
She now lives in Florida, employed and engaged, and her children are flourishing.
Read the case note: At the courthouse door, the father settled.Custody2014
Four school witnesses. Sole custody for a father.
In 2012 the firm won the father temporary custody. At trial, four witnesses from two schools testified to how the child had struggled in the mother's care, including her refusal to consent to special education services.
The outcome
Sole legal and physical custody. The judge limited the mother to six hours a week, less than we would have settled for.
Read the case note: Four school witnesses. Sole custody for a father.Grandparents' rights2014
Under cross-examination, the mother gave up the fight.
The grandparents took temporary custody when the parents could not care for the baby. After years of absence, the mother forced a trial. Once Mr. Seidner began to cross-examine her, she acknowledged she was going to lose.
The outcome
She put in writing that she was giving up the fight, and the child stays with the grandparents.
Read the case note: Under cross-examination, the mother gave up the fight.Divorce2013
Halfway through trial, the husband settled.
Our client was the family's breadwinner. Midway through trial, our witness offered very damaging evidence, and Mr. Seidner was proving the husband had wasted marital assets. He settled to avoid several more days of trial.
The outcome
Our client obtained custody, child support and the house, and the husband waived maintenance.
Read the case note: Halfway through trial, the husband settled.Protection2014
Video of the attack, admitted over objection.
Our client testified in Nassau Family Court and offered an eyewitness to the violence he was subjected to. Over the other side's objection, the firm got a brief video of the attack into evidence.
The outcome
The court awarded our client a one-year order of protection.
Read the case note: Video of the attack, admitted over objection.Support2013
Support before the divorce was even decided.
A mother of three asked the court for support while her case was pending. Mr. Seidner argued the motion over vehement objections from the husband's counsel, who said she was not entitled to relief.
The outcome
Temporary maintenance, child support and attorney's fees.
Read the case note: Support before the divorce was even decided.Prior results do not guarantee a similar outcome.
See all resultsWhat our clients say
Reviews from people we've represented, in their own words.
Prior results do not guarantee a similar outcome.
Review 1 of 26
Throughout the whole process I felt confident that I choose the right attorney. Matthew S. Seidner’s professionalism and expertise were of invaluable help and support to me during my divorce process. My intention was to pursue an amicable divorce and Matthew was clear in his respect and support of that intent. During the entire process, his office staff was welcoming and responsive to my calls and questions in a positive and supportive way. When my emotions were running high, they brought a calm and measured approach that made me feel supported and understood. Words cannot express the gratitude I have for making my divorce process as stress free as possible. What mattered the most to me is that Matthew understood the need for my family to come out of this divorce with the least amount of damage possible for the sake of my children, with that being said I would not hesitate to refer a client to Matthew S. Seidner.
If you want to win and see the light at the end, Matthew Seidner is the attorney to hire. I hired Seidner & Associates for my child custody and child support case. My case went on for 3 1/2 years and throughout that entire time, Matthew Seidner was by my side. When I couldn’t see the light at the end of the tunnel, he encouraged me and keep my hopes up. He handled my case and treated me like family. Matthew Seidner is a very experienced, professional and passionate attorney.
Matt presented my position to the Court in an extremely confident manner and, piece-by-piece, dismantled his opponent’s arguments resulting in a favorable verdict for us. 13 years after my initial divorce, I had to return to Queens Family Court to respond to a host of motions by my ex-wife. At first I thought that I could handle the matter myself but ultimately, I made the decision to retain an attorney that would vigorously defend my rights as a father. After meeting three different attorneys, I had the privilege of meeting Matt Seidner. From the initial consultation to our court date, Matt consistently helped me to take emotion out of my decisions and to focus exclusively on the law. Matt Seidner is one of the best family law trial attorneys that I have ever seen and the only attorney that I would consider to defend my rights as a father.
I interviewed many lawyers before hiring Matt Seidner. Something just felt right with him and I went with my intuition because I knew I was only going to get one chance at this case. I wanted to relocate to Florida with my three children so we could have a better life after being abandoned by a deadbeat husband and father. Matt fought so hard for me all the way. The other side obviously knew they were going to lose so they tried every delay tactic in the book but it didn’t matter. Matt kept me calm, put them in their place, got the court on our side, and now I’m in Florida with my kids. His entire staff knew my case and I felt like part of their family. Kristen and Nicole were really on the ball. Now that it’s finally over, I’ll miss everyone. Thank you so much!
I have 2 children. Matt made sure that my children and I were taken care of. He is an attorney that truly cares, especially in cases that involve children. Matthew Seidner is a good lawyer. He helped me through a difficult divorce.
I hired Mr. Seidner in 2017 to represent me in the matter of child support following my divorce. He was always very professional, attentive, supportive and kept me informed immediately throughout the case. He was always interested in finding a resolution that would be in my family’s best interest and always made himself available if I had any questions or concerns. He and his affiliates were always there to guide me through anything I needed or had any concern about.
Matt Seidner helped us gain temporary custody of my Grandson (6 years old). I’m positive we will get custody of my Grandson. Seidner and Associates treats us like family. If anyone is looking for an excellent lawyer I recommend Matt Seidner and his wonderful team.
A divorce is a stressful time. My goal was to find an attorney who was able to advise me of ALL my options, and yet was willing to accept my decisions regarding how to proceed. I found that Matthew Seidner’s number one concern was always for advising me of my options throughout the process. Unlike previous legal experiences with other law firms, I was always able to speak with him directly, although I must say I found his legal staff to be very experienced, informative, and I felt comfortable working with them as well. I was kept informed constantly through the entire process. My main goal was a quick and fair settlement… my experience was a 10 out of 10.
You feel like one of the family there and know you are taken care of. When I came to the Seidner firm I was sad, confused dealing with a subject I knew nothing about, and felt I may be judged by my family’s craziness. I felt welcomed and comfortable. One of the staff was already dealing with the same family situation and made me see it is not so unusual. The staff act as family towards each other and have great respect for Matt. I can see why. Matt is kind, smart, sincere, and really works hard for his client.
I had the pleasure of meeting Matt during my times of despair. My Case was very complicated because it involved international child custody and Matt handled this case as if it was right here in his backyard. My Daughter that I have been fighting for over 18 months was in my care within 48 hours after meeting Mr. Seidner and his devoted team. His professionalism and dedication is remarkable. He guided me every step of the way without ever feeling lost, he made me aware of his every move and never once gave me false hope. His work ethics is great, non-judgmental, diligent, compassionate and caring; he is the true definition of an advocate. Even if my case had not turned out the way it did I would have not been disappointed in Mr. Seidner’s work because I knew he put his all into it. If you choose Attorney Seidner to represent you, trust me you will be blessed beyond measure. Again with great pride I highly recommend Mr. Matthew Seidner.
Wow, I’m so blessed to have found Matt. When I realized things were getting out of hand with my son’s affairs at his home I decided to take action, into this matter. See, my son, is my life. Also he is all I’ve got. I was feeling very powerless, and very emotional about this whole situation, since 99.99% of the people I have spoken to about father custody were telling me that the mother has a whole lot more power than the father when it comes to custody. But, all it took was a phone call and a simple interview with Matt. Wow, he reassured me in such way that it was going to be fine. He immediately picked up his pad, and started to write away. By the time I explain my whole situation, he gave me this reassuring smile and told me, “Ish, you got a case here”. After he explained all, he asked me if I want him to represent me, and I took a leap of faith, and I agreed….Wow, that was by far the best decision I’ve ever made in my life. And may be a year or less I think “cause it went so fast” we won the case. See I didn’t win the case, nor my spouse, but justice was done for my son. Now we are happy together. My son cannot thank Matt enough. Matt God bless you and your family…… Me and my son are forever in ded to you, friend.
I could not go to sleep tonight without letting you know how impressive you were in court today. I am still in awe. Thank you for believing in me and recognizing the values of love, commitment and dedication that are inherent in my relentless pursuit to find my kids. It is a leap of faith coupled with grit and determination that I am here to defend my rights to my children. I realize very well that this case is engaging much more time and resources than we would have cared for but I refuse and will not allow money to be a deciding factor on whether I continue or stop. I am prepared to utilize all my savings and sell all my assets if that become necessary to fight for my children. Again I want to compliment you for an excellent job. Despite being grief stricken I enjoy working every step of the way with you. The professionalism and dedication of you and your team is truly remarkable. Please give my kind regards to your team.
He won me my case for my relocation and custody and I will be starting my new life down south. He treats you like a person, not just another case. Working with Matthew and his staff was a Pleasure. He did everything he said he would. His whole staff is a pleasure to deal with. I would recommend Matthew to everyone. He is the best lawyer I ever had and would use him again if I ever needed.
Within minutes of meeting Mr. Seidner I had hope for the first time in months. His caring ways made you feel like family. When I came to Seidner & Associates, I was at my lowest point, and felt I had nowhere to turn. His staff is always willing and happy to speak with you and answer any questions. They are the best. You will never find better. When all is said and done I will definitely miss them all.
Attorney Seidner & Attorney Devaney were really fantastic, and they did help me and my children. I could secure and obtain what I needed for us. Without their support, we could not maintain our happy and peaceful life! Thank you so much.
I’ve had a great experience with this attorney at law. We were successful in dismissing the order being pursued to me. He did a great job and I am very thankful to him and his associates, Kristen in particular. I highly recommend Matt and his law firm, Seidner & Associates, PC.
When I walked into Matt’s office, I had just come off an emotional roller coaster. I was about to leave the country and needed someone, who was going to represent my case, while I was away. He listened to me and gave his opinion on how to best handle the situation and we moved forward. There were the inevitable bumps on the road, each of which were handled swiftly and with grace. Matt and Kristen were always available when I needed information and their legal advice helped keep my situation in perspective.
Matt, Regardless of the outcome I want to thank you for your professionalism and compassion from day one. I left the hearing today knowing you made the best case possible and the rest is in the judge’s hands. Anyone who comes through your doors is very fortunate to have you represent them. See you soon and thanks, you’re a great guy, and I know I’m not the first to recognize it.
Matt addressed all of my questions and concerns which made me feel very comfortable. He completely understood my situation and my expectations. I was referred to Seidner & Associates by a close friend of the family. She advised that I would be very pleased with their services and she was right. Overall, I was very satisfied with my outcome and the service they provided.
Matthew Seidner is very professional. He is a human being with heart and soul. He knows exactly what to say to you in troubled times to make you feel better. I was very stressed out regarding my matter and he was able to alleviate my anxiety. I achieved a lot in a short period of time. My case was resolved quickly and I was able to get much more than I expected. Thank you to Matthew and everyone at the Law Offices of Seidner & Associates.
Seidner & Associates was a breath of fresh air after meeting with many other attorneys who were unsatisfactory. From my first interaction with Mary Lou who scheduled my first appointment to meeting Matt Seidner, I knew this was a law firm that truly cares. I am confident in their capabilities and have nothing to worry about knowing that Seidner & Associates is my law firm.
I felt very confident that my matter was being handled with the utmost dedication and professionalism. I found the service I was provided to be very professional and the staff was always very courteous.
You know that you are in extremely good hands when you come here. That gives us a feeling of security and peace of mind. Finding an attorney that is extremely knowledgeable, caring and dedicated is wonderful. However, his office staff is the sweetest, kindest people you ever want to know.
Good Evening Matt, I just wanted to say thank you again for the time spent today during our consultation. I appreciate the brutal honesty you displayed. Over the last 8 years or so, I’ve gotten the run around and have thrown away tons of money with no good outcome. Thank you for telling me the truth and not just taking my money only to tell me later I never really had a good case. If I hear of any co-workers/friends that are in need of assistance, you’ll be the first lawyer they call. All the Best in 2012.
Matt is the best lawyer on Long Island. He is fully committed to helping you as client and will not rest until he makes sure that you win your case. His high level of professionalism is unmatched and I highly recommend that you choose him as a lawyer for your case.
I am extremely happy with the services provided by Mr. Seidner. Everyone at the firm is very nice, very good and on the ball. Matthew has been the greatest. He has a lot of patience and is very tolerant.
Clear answers before you decide anything
Short answers from our articles. Every family is different, so the free consultation is where we look at yours.
How much will a divorce cost?
Each case is different and thus cost is extremely difficult to estimate. In general, the number and age of children involved, a couple’s financial and employment situation, the more assets a couple might have, and the length of the marriage can all have an impact on the cost of a divorce.
When couples are able to amicably decide potentially complicated issues like child custody, visitation, support for children and/or spouses, property division, etc., a case will demand less billable hours than one in which a judge is forced to decide the parties’ fate.
Read the full article: How much will divorce cost?What is an uncontested divorce?
Couples may agree on matters like child custody and support, visitation and spousal maintenance. For these couples, uncontested divorce is the best route.
In New York, an uncontested divorce requires the filing of an “Uncontested Divorce Packet.” Our law firm can help you avoid costly delays or problems with filing by completing the necessary documents for you.
Read the full article: What is uncontested divorce?Can child support be changed later?
Both the custodial or non-custodial parent can ask for a modification depending on the circumstances of either party. Modification can occur due to one of the following factors:
- A “substantial change in circumstances”
- More than three years have passed since an order was issued
- A change in income of 15% or more
What if my spouse earns less on purpose to pay less support?
In some instances, one party might seek to reduce their financial obligation by artificially reducing their earnings. When this occurs, a judge can impute income. Imputing income means that the judge assigns a different income amount than what they report they are currently earning based on their earning capacity.
Read the full article: What is imputing income?Do fathers have the same custody rights as mothers?
In New York, the court is supposed to ignore the respective gender of each parent and focus instead on the best interest of the child when determining custody, support, visitation, etc. A court may find that it is in the child’s best interests to grant custody to the father.
Read the full article: What are father’s rights?Can grandparents ask for visitation?
In order to obtain rights, there must have been an existing relationship in place. The bottom line comes down to whether visitation is harmful or beneficial to a child. Courts will also consider the best interest of the children.
Read the full article: Grandparents’ rights in Queens, New YorkYou are not another file on a shelf.
Talk to us. The first consultation is free.
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The National Domestic Violence Hotline is free, confidential and open 24/7. 1-800-799-7233 or text START to 88788.
- Office
- The Garden City Center Building
100 Quentin Roosevelt Blvd., Suite 401
Garden City, NY 11530Get directions to The Garden City Center Building (opens Google Maps in a new tab) - Phone
- (516) 345-9900
- Fax
- (516) 345-9902














