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Mario J. DeRossi
also known as DeRossi Law Firm, LLC
About Mario
Biography
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.
Practice Areas
4
Practice Areas
Fees and Rates
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Chat withLicenses
Licensed in New York for 24 years
State: New York
Acquired: 2001
No misconduct found
Licensed in Massachusetts for 24 years
State: Massachusetts
Acquired: 2001
No misconduct found
Location
DeRossi Law Firm LLC
100 Old Country Road, Suite 301, Mineola, NY, 11501
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Mario J. DeRossi's Reviews
Avvo Review Score
113 Client Reviews
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Practice Areas
What Clients Mention
Recommendation (53)
Case Results (46)
Communication Style (43)
Professionalism (43)
Advocacy (39)
Character & Conduct (39)
General Knowledge (35)
Responsiveness (34)
Trustworthiness (31)
Compassion (30)
Practice Area Knowledge (29)
Cost of Services (18)
Staff & Support (16)
Punctuality (5)
Free Consultations (2)
Showing 6 - 10 of 29 reviews | Practice Area Knowledge
Posted by Riv | March 10, 2021 | Hired Attorney | Divorce & Separation
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 ...
Posted by Pete | May 15, 2020 | Divorce & Separation
Divorce
My divorce was about the most chaotic, perplexing, insanely frustrating divorce in the history of divorces. Don’t take my word for it. Ask my attorney, Mario DeRossi. I’m sure, like me, it’s permanently etched in his memory. Mario DeRossi is just about the most professional, ethical attorney I hav...
Posted by Sam | February 16, 2020 | Hired Attorney | Divorce & Separation
Profesional. Respected. Responsive.
Mr. DeRossi was phenomenal throughout my entire divorce. He was blunt and honest from the very beginning, and, in the end, he was spot on, properly setting my expectations from my very first consultation with him. Many friends and family members that went through the process unfortunately had one maj...
Posted by Jessica | June 22, 2019 | Hired Attorney | Divorce & Separation
I Highly Recommend Mario
Picking the right lawyer is a very scary decision, but I dont know how I could have went through this divorce process without Mario and his amazing office staff. Whenever I had a question or didnt understand something he was always available and there for me. There were times during the process that...
Posted by Kayon | February 22, 2019 | Hired Attorney | Divorce & Separation
Professional attorney
I went to Mario with what I thought was a very complex divorce. Mario was so knowledgeable about his work that it was very simple for him.. I’m happily divorce under a year later and would for sure say Mario is your guy.. Very professional and attentive to your needs. My schedule was hectic but mad...
Mario J. DeRossi's Lawyer Endorsements
"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."
"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."
"Exceptional attorney, dedicated to client success. Highly recommended."
"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!"
"I endorse this lawyer. Mr. DeRossi is an extremely talented and knowledgeable attorney. He is "old school" in that his word is his bond."
"I endorse this lawyer."
"I endorse this lawyer. Mario is always well prepared, clever and quick on his feet. He is an excellent attorney."
"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."
"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."
"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."
"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."
"A strong advocate and always professional, Mr. DeRossi is an experienced attorney who offers practical solutions to resolve difficult issues."
"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."
"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."
"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."
"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."
"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."
"I endorse this lawyer's work. He is an amazing, detail oriented, and professional litigator."
"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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Experience
Honors
2025
Super Lawyer, Super Lawyers
2024
Super Lawyer, Super Lawyers
2023
Super Lawyer, Super Lawyers
2022
Super Lawyer, Super Lawyers
2021
Super Lawyer, Super Lawyers
2020
Super Lawyer, Super Lawyers
2019
Super Lawyer, Super Lawyers
2018
Super Lawyer, Super Lawyers
2017
Super Lawyer, Super Lawyers
2016
Rising Star, Super Lawyers
2015
Rising Star, Super Lawyers
2014
Top 40 Under 40, The National Trial Lawyers
2014
2014 New York Metro Rising Stars, SuperLawyers
2014
Top Ten Ranking, The National Academy of Family Law Attorneys
2014
Top 40 Lawyer Under 40, The American Society of Legal Advocates
2014
Rising Star, Super Lawyers
2004
Award for Trial Advocacy, The Association of the Bar of the City of New York
2003
Army Commendation Medal, Trial Defense Service, United States Army
2003
Bronze Star Medal, Fourth Infantry Division, United States Army
2002
Army Commendation Medal, Fourth Infantry Division, United States Army
Work Experience
2009 - Present
Partner, Stern & DeRossi, LLP
2006 - 2009
Associate, Stern, Adler & Associates, LLP
2002 - 2006
Judge Advocate, United States Army
Associations
2014 - Present
The National Academy of Family Law AttorneysMember
2014 - Present
The American Society of Legal AdvocatesMe
2009 - Present
Nassau County Bar AssociationMember
2009 - Present
New York State Bar Association, Family Law SectionMember
2009 - Present
Columbian Lawyers AssociationMember
Education
2001
Saint John's University, School of Law
Juris Doctor
Languages
English
Activity
Legal Answers
Legal Answers
Q&A
I filed an uncontested divorce on 4/18/14 in Kings. What should the eTrack show for a completed divorce?
13 Jul 2014
Q&A
How do I get divorced if my husband is in Morocco?
22 Oct 2011
Q&A
I filed an uncontested divorce i have 2 children with my spouse. we both agree on childsuppport and shared custody. He has been
16 Sep 2011