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About me

After I was admitted to the bar in 1983, I joined the law firm that my father had started decades earlier. Shortly after, we became partners and engaged in a general and highly eclectic practice through which I gained broad knowledge and experience in a wide variety of fields of law.


Over time, however, it became increasingly clear to me that, in order to truly excel as an attorney, I would have to focus my time, effort and attention on a single area of the law. Ultimately, I chose family law because its challenges and opportunities best suited my skills and temperament.  


As a family law practitioner, I am equally at home in the courtroom and behind the desk. I have negotiated and prepared scores of agreements, including prenuptial, postnuptial, and separation agreements. I have extensive experience both prosecuting and defending trials and hearings in the Supreme and Family Courts, including actions for divorce, equitable distribution, spousal maintenance, child support, custody and visitation. I have handled numerous appeals, as well as proceedings for enforcement and modification of judgments and agreements. 


I strive continuously to improve my knowledge and skills so that I will be able to give each and every one of my clients nothing less than the best professional advice, counsel, and representation. My precept is this: passion for the law, and compassion for my clients.







Practice areas


  1. Divorce: 40%
  2. Child Custody: 20%
  3. Prenuptials: 20%
  4. Child Support: 10%
  5. Family: 10%



Fixed (sometimes), Retainer (always)

Payment types:

Check, Credit card

Attorney endorsements

10 total 

Are you an attorney? Endorse this lawyer

  • Ian William MacLean

    Every one of the people I have recommended speak with Keith Orenstein has called or emailed me with some version of "Thank you so much for putting me in touch with Keith. He is terrific." I have known Keith since 2005 and he is one of the most level headed, even tempered people I know. He is also an excellent and heavily experienced matrimonial attorney who listens to his clients and gets results. I have sent several clients and friends to Keith and will again without any hesitation.


    Ian MacLean Litigation Attorney
    Relationship: Worked together on matter

  • Paul Holliday Wilson III

    I have known Keith for years, and know many people who have either used his services personally or recommended his services to their friends, colleagues and/or clients. Keith is unwaveringly spoken of as an expert and an amazing guiding hand through what is one of the toughest areas of law in which to practice. He has the ability to approach matters gently when called for, or to be an aggressive pit-bull. I highly recommend Keith for anyone in need of an excellent family law attorney.


    Paul Wilson Business Attorney
    Relationship: Fellow lawyer in community

Contact info

Orenstein & Orenstein, LLC

830 Third Avenue, 5th Floor
New York, NY, 10022


NYCurrently registered 198307/10/2016
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
New York Metro Super LawyersSuper Lawyers2015
Bar Register of Preeminent LawyersMartindale-Hubbell2012
Bar Register of Preeminent LawyersMartindale-Hubbell2011
New York's Top LawyersArrive Magazine2011
Who's WhoStrathmore's2010
Bar Register of Preeminent LawyersMartindale-Hubbell2010
Legal Elite - New York City's top matrimonial law attorneysAvenue Magazine2010
2010 Top Family Law Blog Awardcriminaljusticedegree.net2010
Bar Register of Preeminent LawyersMartindale-Hubbell2010
Bar Register of Preeminent LawyersMartindale-Hubbell2009
Who's WhoStrathmore's2009
Bar Register of Preeminent LawyersMartindale-Hubbell2008
Bar Register of Preeminent LawyersMartindale-Hubbell2007
Bar Register of Preeminent LawyersMartindale-Hubbell2006
Work experience
TitleCompany nameDuration
PartnerOrenstein & Orenstein, LLC1983 - Present
Association namePosition nameDuration
New York State Bar AssociationMember1987 - Present
Association of the Bar of the City of New YorkMember1987 - Present
Legal cases
Case nameOutcome
Pittman v. WilliamsJudgment reversed.
Kevin J. v. Jennifer J.Successfully opposed petition.
Craig S. v. Donna S.Successfully opposed petition.
See all legal cases 
Publication nameTitleDate
Aspatore Books (West Publishing)Understanding Enhanced Earning Capacity2012
School nameMajorDegreeGraduated
Boston University School of LawLawJD - Juris Doctor1982
Columbia UniversityEnglishBA - Bachelor of Arts1979

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