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Mario J. DeRossi

Divorce and separation Attorney at Mineola, NY

4.9   109 reviews

also known as DeRossi Law Firm, LLC

Virtual consultation available
Virtual consultation available
  • State Years
    New York - NY 21 years
    Massachusetts - MA 21 years
  • Licensed for 21 years
    State NY
    Acquired 2001
    Status
    Currently Registered No misconduct found
  • Licensed for 21 years
    State MA
    Acquired 2001
    Status
    Inactive No misconduct found

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

About Mario

Learn Mario’s areas of practice.

HONEST ASSESSMENT. STRAIGHTFORWARD ADVICE. CALL NOW! 516-279-2010

Mario J. DeRossi is a civil litigation attorney practicing in both the federal and state courts of New York.  His practice concentrates in the area of Family Law, including, divorce; child custody; and child support; property division; division of retirement benefits; tax consequences of divorce; annulments; paternity; grandparent's rights; domestic violence; and post-judgment proceedings.


Mr. DeRossi began his career as an officer in the Judge Advocate General’s Corps of the United States Army.  While a Judge Advocate, he served as lead counsel in more than fifty courts-martial.  Most notable, Mr. DeRossi successfully defended fellow officers charged in the highly publicized detainee abuse cases at  Abu Ghraib, Iraq and Bagram, Afganistan.  Mr. DeRossi was also deployed to Iraq as part of Operation Iraqi Freedom, where he served as a military magistrate.

 

Mr. DeRossi has a unique philosophy in handling Family Law matters.  He believes that every client deserves individual attention and the best representation possible.  Based upon this philosophy, he has developed a successful Family Law practice.  He also recognizes the emotional trauma and pain individuals suffer when going through a divorce.  As a result, he offers his clients the time and the experience necessary to guide them through one of the most difficult experiences in their life.  In every case, Mr. DeRossi, first attempts to bring about a quick, civilized, fair and inexpensive resolution.  However, if that cannot be accomplished, he offers aggressive professional representation.  Mr. DeRossi has developed a reputation for attending to the individual needs of his clients.

Mr. DeRossi is a member of the state bars of New York and Massachusetts.

Mr. DeRossi received his Bachelor of Arts from St. John’s University, graduating magna cum laude.  He received his Juris Doctor from St. John’s University School of Law in 2001.

Contact Mario

DeRossi Law Firm LLC
1565 Franklin Avenue
Suite 301
Mineola, NY, 11501

Reviews

4.9 / 5.0
  109 customer reviews
Posted by Chad | August 18, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Great guide through troubled waters
Mario is a no nonsense attorney who will help you through what is to most people a life altering event. His " rip the band-aid off " approach is what helped me through one of the most tumultuous times in my life. There were times through the process I did not understand his approach but I do now. I highly recommend Mario as an attorney and a guide through anyone's unfortunate Divorce or separation.
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Posted by anonymous | June 4, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Mario Delivers
Mario fought for me and for my children. As a father I sought full residential custody and I got it. Without him I may have lost them. He was always straight with me. He wasn't afraid to tell me hard truths when needed. He listened and remained focused on my goals. He is tough, smart, honest and relentless. His entire staff is great. Going through a divorce can be a gut wrenching experience. Having Mario in my corner made all the difference.
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Posted by anonymous | January 27, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Mario, a truly dedicated attorney
Mario was a referral from a close friend. I was starting the predivorce process and desperately need some sound advice. I called Mario and explained my horrendous scenario. Mario asked if he might review my 30 page prenuptial. After reading the document, Mario shared his review. I might add, I had not hired him as of yet and he volunteered to read my entire prenuptial. This attorney who I really didn't know, spent a lot of time reading my document and talking with me on the phone. I remember the call was almost one hour. I was impressed, to say the least. I moved forward with hiring Mario as my divorce attorney. He was very patient, clear in his communication and listened to all I had to say. We worked together as a team. I contributed my thoughts along the way. Mario was always open-minded as the divorce continued. I was provided with how the court system worked along with the various episodes that might occur. My first time in court was stressful for me. Mario helped me to relax and stay on the path we had set up. With support and preparation from Mario, my future meetings went smoothly. My divorce is soon to be final. I thank Mario for his knowledge and expertise, plus I thank his office staff and Nicole. They were always pleasant, accountable and available. I found Mario to be very dedicated in assisting me with my divorce. I highly recommend him to anyone looking for a divorce attorney.
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Posted by anonymous | September 29, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Shark with a Heart
A mom at school asked if I had a divorce lawyer yet. I was heavily leaning toward using someone else at the time. She went on to say her divorce lawyer wasn't very good but that her husband's was a real shark. Oh, I'm so sorry, I said. And also, awkwardly, can I get your husband's lawyer's phone number? That's how I came to meet Mario DeRossi. It was love at first zoom. He was knowledgeable, clear, and concise. He had a heart and the no nonsense attitude I knew I needed. As a mom, I thought long and hard about whether or not to divorce. I contemplated staying until our little daughter went to college. In the end, I decided I had to divorce. I was terrified of the custody portion. While I'm not rich, I'm a hard worker and can make more money, but the custody had me paralyzed. I didn't want our daughter to feel like a ping pong ball, etc. so, getting as much custody as possible was my top priority. And Mario succeeded! And with flying colors! He fought for me to gain primary physical custody. I came out better than I'd thought financially. I felt I had a true partner. Mario was on time and on top of things. He came to every call prepared. He answered every email - sometimes just a sentence - but there was always a reliable and informed answer. I could call and make an appointment whenever I wanted. He made himself available. Throughout this whole process Mario has been my secret weapon. When I felt nervous and anxious at night I would revisit our conversations. I remember telling him I was scared we'd have to do 50-50 custody since it seemed preferred by the court, according to Google. He told me I don't do 50-50, that's not how I roll. I would say that to myself over and over. The day of my trial Mario kept me abreast of everything from the moment I woke up. We ended up settling and it was magical - Mario jumped into action and finagled numbers around. He told me this was my life and he would fight for what I wanted and that this was my decision and only my decision. I told him to guide me. I could not be happier with the result. I now have primary physical custody - my top non-negotiable and ended up better than I expected financially. Additionally, Mario was super fair with his billing. I wasn't charged when he read my emails etc (I also was mindful of how much I emailed). I've since recommended Mario to another mom. My whole focus was on our daughter and Mario just got it. He's like your smart friend - the one that's super cool and you love hanging out with but is very busy so you meet while you can and ask everything you can think of. I love Mario. I'm actually sad I don't have to talk with him anymore. But I'm glad to be onto my next chapter. I highly recommend Mario DeRossi. Hiring him to represent me in my divorce was the best decision I made.
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Posted by Donna V. | August 20, 2022
This review is from a person who hired this attorney.
| Hired Attorney
TOP NOTCH DIVORCE ATTORNEY
Mario is passionate about his work as a divorce attorney. He is very honest and his expertise of the law is very impressive. He always took the time to explain legal issues/matters to ensure that I understood clearly the what’s and why’s. He was always prompt when responding to any questions and updating me with his findings. He is extremely fair and doesn’t waste his clients time or money. His office staff is very professional and pleasant to speak to He is a “Top Notch” divorce attorney. I would highly recommend Mario without hesitation.
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Posted by anonymous | May 9, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Great law firm!
Mario and his team is caring and efficient. They make you feel comfortable when speaking with you and they take the time to answer all of your questions. Mario is very knowledgeable of the law. He will advise you correctly and will always make your needs a priority. In court he will stand up and and advocate your wants and needs in a way that will be heard, never pushing you into a decision that is not your own. If you need representation, someone who will put you first look no further.
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Posted by Michael | April 29, 2022
This review is from a person who hired this attorney.
| Hired Attorney
You will be in good hands.
I have had a fair amount of legal dealings in business and consider myself a relatively logical independent person. The dynamics of family law feel much different to me, there are emotions involved, decisions are complicated, compromise is often inevitable, and the results have a material impact on many lives. The best course of action is not always clear, it can be painful, it can be confusing, even to a logical and rational thinker. You need guidance from someone who understands and has a feel for the law. From my experience in the past year, Mario has a special talent for practical strategy and keeping things on course. All while respecting the factors that are most important to you. Mario always knows the answer, whether it be a technical legal question or more importantly, what to do at complicated decision points.
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Posted by Julie | April 26, 2022
This review is from a person who hired this attorney.
| Hired Attorney
The best of the best!
I cannot say enough good about Mario DeRossi. He truly navigated me through one of the hardest periods of my life. He was honest with me about what I could expect and the outcome was exactly as he said it would be. He always responded to my communication in a timely manner and, although I was quite naïve and ignorant about many issues relating to the divorce, he really took the time to explain everything to me and reassured me many times, "there's no such thing as a stupid question." Even when I was ready to concede on several issues, he encouraged me to let him be my advocate and stated, "I don't want you taken advantage of." In addition, he was extremely reasonable when billing me for his work. I am familiar with the practice of others who bill for every minute spent on a case and that was not my experience at all with Mario. I would not hesitate to recommend Mario DeRossi to anyone. His expertise instilled a strong trust in me that I would be in good hands, and indeed I was, as he fought for me (and won!) on many difficult issues.
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Posted by Matthew collura | April 4, 2022
This review is from a person who hired this attorney.
| Hired Attorney
A FRIEND
I honestly don’t know where to start. To be honest I didn’t always see eye to eye with Mario on my case (I never told him that) . But as time went on I realized that a lawyers job isn’t to tell you what you want to hear . Mario never misled me. I asked him in the beginning where am I going to be when this is over and when I signed my divorce exactly where he said I was going to be was where I ended up . The only difference I hired someone who helped me grow as a man . When I first hired mario and now today nearly a year later I feel like a completely different man and mario had a lot to do with that . He is the definition of excellence when it comes to divorce law . I would recommend him to anyone when it comes to divorce. The separation period is the toughest period in anyones life , especially when you have children . But thank you to Mario Derossi I’m out of the prison and living my life again . He’s the best and he is and always will be a friend because of the way he represented me during the most difficult period of my life . Thanks again Mario!
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Posted by Francesca | January 5, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Knowledgeable and honest
Mario was kind, honest and a great support during a difficult situation. He always responded to my questions or concerns and always took the time to explain legal situations to me. I recommend him whole heartedly!!!
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Cost

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Contact for Details

Resume

AVVO RATING 10.0 (Superb)

Work Experience

  • Partner
  • Stern & DeRossi, LLP
  • 2009 - Present
  • Associate
  • Stern, Adler & Associates, LLP
  • 2006 - 2009
  • Judge Advocate
  • United States Army
  • 2002 - 2006

Education

  • Saint John's University, School of Law
  • Juris Doctor
  • 2001

Associations

  • The National Academy of Family Law Attorneys
  • Member
  • 2014 - Present
  • The American Society of Legal Advocates
  • Me
  • 2014 - Present
  • Nassau County Bar Association
  • Member
  • 2009 - Present
  • New York State Bar Association, Family Law Section
  • Member
  • 2009 - Present
  • Columbian Lawyers Association
  • Member
  • 2009 - Present
View all associations

Languages Spoken

  • English

Honors and Awards

  • Top 40 Lawyer Under 40
  • The American Society of Legal Advocates
  • 2014
  • Top Ten Ranking
  • The National Academy of Family Law Attorneys
  • 2014
  • 2014 New York Metro Rising Stars
  • SuperLawyers
  • 2014
  • Top 40 Under 40
  • The National Trial Lawyers
  • 2014
  • Award for Trial Advocacy
  • The Association of the Bar of the City of New York
  • 2004
  • Bronze Star Medal
  • Fourth Infantry Division, United States Army
  • 2003
  • Army Commendation Medal
  • Trial Defense Service, United States Army
  • 2003
  • Army Commendation Medal
  • Fourth Infantry Division, United States Army
  • 2002
View all awards

Attorney endorsements

Received (19)
Given (18)
Endorse Mario
Divorce and separation Attorney | Sep 17
Relationship: Fellow lawyer in community
"A powerful and zealous advocate for his clients, Mario has earned the respect of his peers and the judiciary. His level of civility is second to none, which makes him an even more effective advocate. His effectiveness is surpassed only by his keen intellect. I wholeheartedly endorse him."
Divorce and separation Attorney | Sep 19
Relationship: Opposing Counsel on matter
"I endorse this lawyer. Mario is an excellent attorney. We've had a couple of cases together and he's a zealous advocate for his clients while remaining a gentleman."
Divorce and separation Attorney | Feb 13
Relationship: Fellow lawyer in community
"Exceptional attorney, dedicated to client success. Highly recommended."
Divorce and separation Attorney | Oct 02
Relationship: Fellow lawyer in community
"Mario is an exceptional attorney. His knowledge of family law matters is impressively extensive, but more importantly she has a deep focus on the needs of her clients. Highly recommended!"
Divorce and separation Attorney | Jan 22
Relationship: Opposing Counsel on matter
"I endorse this lawyer. Mr. DeRossi is an extremely talented and knowledgeable attorney. He is "old school" in that his word is his bond."
Divorce and separation Attorney | May 29
Relationship: Worked for lawyer
"I endorse this lawyer."
Divorce and separation Attorney | May 17
Relationship: Opposing Counsel on matter
"I endorse this lawyer. Mario is always well prepared, clever and quick on his feet. He is an excellent attorney."
Commercial real estate Attorney | May 14
Relationship: Fellow lawyer in community
"A truly excellent attorney well respected in the legal community. I wholeheartedly recommend him to anyone looking for a lawyer who knows the law and truly cares about protecting the rights of his clients and getting them the most favorable result possible."
Divorce and separation Attorney | Sep 15
Relationship: Fellow lawyer in community
"Mr. DeRossi is an outstanding attorney who provides exemplary advice on Avvo. I would recommend everyone and anyone to him for representation. Even though I have been practicing fo 24 years, as a judge, magistrate, prosecutors, and in private practice, I learn valuable new information from him every day. A superb attorney."
Divorce and separation Attorney | Jun 09
Relationship: Fellow lawyer in community
"I endorse this lawyer. Attorney DeRossi is an outstanding attorney with an exceptional reputation. He is a strong and zealous advocate for his clients and a credit to the legal profession. I highly recommend his legal services."
Divorce and separation Attorney | Apr 10
Relationship: Fellow lawyer in community
"Having known Mario for a few years now, I can firmly state that he is a gifted attorney that advocates for his Client's in a manner rivaled by few. Not only does Mario have a profound knowledge of the law, but he truly is personable and attentive to his Clients which gives all those that go to him a genuine sense of comfort in such a stressful situation. I would and do recommend Mario to all Clients seeking representation in matrimonial related issues."
Divorce and separation Attorney | Oct 11
Relationship: Opposing Counsel on matter
"A strong advocate and always professional, Mr. DeRossi is an experienced attorney who offers practical solutions to resolve difficult issues."
Family Attorney | Jun 21
Relationship: Opposing Counsel on matter
"Mario and i were adversaries in a contested matrimonial case. I found him to be knowledgeable, a true professional, and most importantly, a man of his word."
Family Attorney | Mar 20
Relationship: Fellow lawyer in community
"Mr. DeRossi has an excellent reputation not only among other attorneys but before the bench. It is a privilege to consider him a colleague in an area of law that requires not only intelligence but compassion and patience."
Divorce and separation Attorney | Nov 14
Relationship: Opposing Counsel on matter
"I have had several matters with Mr. DeRossi, and he is a strong advocate for his clients. Mr. DeRossi is very professional and works diligently to assist his clients achieve their intended results."
Family Attorney | Aug 16
Relationship: Opposing Counsel on matter
"Mr. DeRossi displays an impressive level of professionalism and integrity while representing his clients. Not only does he have an obvious command of the law, but also places a high priority on maintaining the trust of opposing counsel."
Divorce and separation Attorney | Aug 28
Relationship: Opposing Counsel on matter
"In a divorce case I handled against Mr. Derossi he represented his client zeaolously and professionally. He protected his client's rights and did not engage in unnecessary litigation that would have wasted our client's money and time. He knows the law and conducts himelf professionally. It was my privilege to work with this attorney."
Personal injury Attorney | Aug 05
Relationship: Worked together on matter
"I endorse this lawyer's work. He is an amazing, detail oriented, and professional litigator."
Divorce and separation Attorney | Apr 30
Relationship: Worked together on matter
"I endorse this lawyer's work. Mario is very competent and considerate of his client's needs. Mario has repeatedly obtained exceptional results for his clients."
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