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Mario J. DeRossi

Divorce and separation Attorney at Mineola, NY

4.9   102 reviews

also known as DeRossi Law Firm, LLC


Licensed for 20 years

About Mario

Learn Mario’s areas of practice.

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.

Licensed for 20 years
State NY
Status Currently Registered
Acquired 2001
Updated 07/19/2022
State MA
Status Inactive
Acquired 2001
Updated 09/19/2022

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

Contact Mario

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

Reviews

4.9 / 5.0
  102 customer reviews
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!!!
Posted by Jodie | January 4, 2022
This review is from a person who hired this attorney.
| Hired Attorney
I couldnt have done it with out him.
Look, divorces arent fun. Some people get lucky and have an amicable spouse and they can simply get divorced by signing a piece of paper and giving each other a hug and going on their merry way. I was not said, person. Mine was ugly, vicious, tough, heartbreaking, soul-destroying, and intense on a good day. When I tell you I would have been lost without Mario, I'm not exaggerating. He would calm me down when I was overreacting, he was present and available when i needed to be talked off that metaphorical ledge, he understood my grief and didn't try to belittle it. He was truly in my corner and I felt it every step of the way. I never had any doubt Mario was there for me, and had mine and my family's best interests at heart. He is sharp, funny, kind, but also understanding of how sensitive marital issues, especially with children are. If you are looking for an attorney that will go to bat for you, i hand on heart, can't recommend Mario enough. Mario, you know I think you are amazing, and I am forever thankful for getting me through one of the most trying times of my life.
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Posted by Edward | September 28, 2021
This review is from a person who hired this attorney.
| Hired Attorney
My Experience with Mario J. DeRossi
Hiring Mario was the best decision I made for my divorce. Knowing it would be a difficult process, he made sure I completely understood everything step by step. He fought for me tooth and nail and would not let me be pushed around. Once we reached court I knew I had made the right decision to have Mario by my side. He truly fought for me with everything he had and was not satisfied unless I was satisfied. I was thoroughly impressed with his knowledge of the law. I would highly recommend him to anyone who wants an attorney who will fight for you.
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Posted by Fran | August 30, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Excellent Divorce Lawyer
I was recommended to Mario DeRossi from a friend of a friend. During my consultation with Mario I could see how knowledgeable and professional he was about divorce proceedings. I also felt his passion for helping the people that were going through the divorce. I knew at the consultation that I felt comfortable with him and I trusted him. During the time we worked together he would respond to my questions quickly by phone or email. He was always upfront and honest about how things could go during the proceedings and what I could expect. His pricing was very fair. I didn't have alot of money to spend and he was very kind and patient and worked within my budget. Mario also has wonderful staff who were very helpful and a pleasure to work with. Lawyers are usually critized for being money hungry and not caring but Mario is not like that. He is professional, knowledgeable, understanding and has a big heart. He really cares about his clients. Thank you soooo much Mario for everything! I will always highly recommend you!
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Posted by Riv | March 10, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Supreme Divorce Attorney you will ever find in New York.
Disappointed, backstabbed with all the bad claims & games both from my previous attorney & ex. I lost all faith in the legal system. Life seemed like a fiasco as I wondered that despite taking all the proper steps my case was indeed going down the drain due to my last attorney (of the American Greed brigade).God guided me and through a mutual friend reference, I came to meet Mr.Derossi. His exceptionally high level of Divorce Law knowledge and the right guidance at the right time came as a blessing in disguise. Personally he is a gem of a person, professionally he is the Ace of Spades. He knows the true value of his clients hard-earned money, reverts all calls in a timely fashion, provides real picture & assurance, no false commitments. My previous lawyer dragged my case on purpose due to her malicious intent, Mr.Derossi exposed the truth. From the stage where I was being pressurized to sign a contested divorce, I finally had an Uncontested Divorce. Even a thousand thanks to him will be less. If this website has 10 stars, I will give him 11 out of 10,  I am obligated for life. Thank you so much, Sir! You are godsent for me indeed. - Regards!
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Posted by anonymous | February 24, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Mario is the man
Mario is legit the best. Hands down. Great guy, easy to speak to and get along with. Top notch divorce attorney. He was honest from the bringing until the end. Always simply referred to law and not any nothing else which is so very important. The divorce ended in a timely matter and Mario billed me extremely fair. What was interesting is it ended up being what he exactly said from the beginning. No empty promises, no nonsense. I will forever recommend him to anyone I know going through divorce. I’m also sure with how well he did his job and how he handled himself, my ex will be referring him as well. For me I’ll be riding into the sunset with prenups and chicken wings. Thanks Mario!
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Posted by anonymous | February 7, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Powerful Representation
A divorce is usually one of the worst times of anyone's life. All through the ordeal, I felt that Mario had my back. I like his straight talk as I know that he will answer my questions honestly and always give me a realistic opinion. For the other side, Mario is a tough negotiator. As for me, his client, he was always available. It was never hard to get an answer from him, no matter how busy he was, he would always return my call the same day. Prior to hiring him, I had met up with several attorneys. However, I chose to go with him primarily because he was the best reviewed divorce attorney on AVVO. That proved out to be the correct decision, on my part. Moreover, he is equally outstanding in a family court setting. I think its important to have good legal representation as its noticed by the other side and it actually helps to expedite settlement and a speedy resolution of the case. At court, I have noticed first-hand, that he's very well respected by other attorneys as well as the judges and court clerks. All this matters. Also, Mario has an excellent team in place at his firm. I had a very good experience working with Nicole (associate attorney), Danielle (paralegal) and Ashley (assistant). Thank you all so much!
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Posted by Jennifer | June 9, 2020
This review is from a person who hired this attorney.
| Hired Attorney
Navigating Through Divorce
I was introduced to Mario through someone who had first hand experience with him and spoke very highly of him. Based on her recommendation, I called for a consultation. What I immediately liked about Mario was his "not out for blood" approach. He listened as I went through my situation and he offered advice when appropriate and impartial opinions when necessary. Throughout the process he educated me in a manner that was never demeaning and a language that I could understand. He always made me aware of my choices but never pushed me in a direction that went against my grain. From the onset, I was very honest and clear about my budget and he 100% respected that. No lip service at all. I can't tell you how many people told me how awful divorce attorneys were and how terrible this experience would be - making the start of this journey so incredibly stressful and terrifying for me. Well, I am here to tell you that Mario made all the difference in the world. He made what could have been a nightmare - an incredibly easy experience. Let me just add that his paralegal, Danielle, is also outstanding with an incredibly eye for detail - leaving no stone unturned. Thank you both so much!
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Cost

We have not found any cost information for this lawyer

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

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)
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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