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David T O'Sullivan

About me

At the O'Sullivan Law Group, we provide comprehensive family law legal services to our clients.  While most "family" law firms focus primarily on divorce and matrimonial related matters, the services provided by the O'Sullivan Law Group extend well beyond traditional "divorce & matrimonial" law firm.

While we provide professional legal services in the areas of divorce and related matters, we also provide legal services in the areas of:

Estate Planning

Estate Administration

Real Estate -- Commercial and Residential


Personal injury


And many other areas.

If it touches you or your family, we stand ready to assist you with your legal needs.


Practice areas


  1. Divorce: 50%
    10 years
  2. Child Custody: 15%
    10 years
  3. Domestic Violence: 15%
    10 years
  4. Child Support: 10%
    10 years
  5. Other: 10%
  6. More 



Free consultation (60 minutes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

4 total 

Are you an attorney? Endorse this lawyer

  • Laura Ruvolo Lipp

    David is a highly skilled and experienced family law attorney who advocates for his clients and yet is a pleasure to work with as an adversary.


    Laura Ruvolo Lipp Family Attorney
    Relationship: Opposing Counsel on matter

  • Carolyn Nicole Daly

    David is a strong advocate for his clients. He is knowledgeable and aggressive, but tries to find a reasonable solution when possible.


    Carolyn Daly Divorce and separation Attorney
    Relationship: Opposing Counsel on matter

Contact info

O'Sullivan Law Group, LLC

191 Washington Street
Morristown, NJ, 07960-3756


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Super Lawyers Rising StarThomson Reuters2016
Super Lawyer's Rising StarThomson Reuters2015
Work experience
TitleCompany nameDuration
OwnerO'Sullivan Law Group, LLC2014 - Present
OwnerLaw Office of David T. O'Sullivan, LLC2010 - 2014
Managing PartnerSimeone & O'Sullivan, LLP2006 - 2010
Vice President Coporate ServicesCushman & Wakefield2005 - 2006
Sr. Vice President - Corporate ServicesTrammell Crow Company2002 - 2006
Director - Advisory ServicesErnst & Young1999 - 2002
Director - Corporate Real EstateAlliedSignal, Inc (Honeywell)1993 - 1999
Judicial Clerk to Hon. Katherine Dupuis, J.S.C.Superior Court of New Jersey1993 - 1993
Judicial Clerk to Hon. David G. Lucas, J.S.C.Superior Court of New Jersey1992 - 1993
Association namePosition nameDuration
New Jersey State Bar AssociationMember2006 - Present
Morris County Bar AssociationMember2006 - Present
New Jersey State Bar Association, Family Law SectionMember2006 - Present
Jersey Battered Women's ServicePro Bono Attorney2006 - Present
Battered Women's Legal Advocacy ProjectVolunteer Attorney2006 - Present
Morris County Bar Association, Family Law SectionMember2006 - Present
School nameMajorDegreeGraduated
Seton Hall University School of LawFinance/ManagementMBA - Master of Business Administration1995
Seton Hall University School of LawLawJD - Juris Doctor1992
Boston UniversityFinanceBS - Bachelor of Science1985
Speaking engagements
Conference nameTitleDate
Webinar SeriesDivorce Planning -- Before, During and After2015
NJ Divorce Q&A Webinar SeriesDivorce in NJ2015
NJ Divorce Essentials WebinarEssentials of Divorce in NJ2015
Understanding Divorce in New JerseyDivorce in New Jersey2009