Family and Divorce Law                                                  Family Mediation

Civil Litigation                                                                    Estate Litigation

Construction Law                                                             Residential Real Estate

Commercial Landlord/Tenant                                      Commercial Real Estate

Collection Litigation

Kelly M. Mattheiss grew up in South Orange, NJ and has remained an active leader in her community. 


  • Juris Doctorate Degree: Seton Hall University School of Law
  • Bachelor of Science in Accounting: Seton Hall University
    • Graduated Magna Cum Laude from the Paul Stillman School of Business

Admitted to Practice:

  • New Jersey, 1987
  • Served as Judicial Law Clerk in Superior Court of New Jersey, Chancery Division, Family Part, Morristown, 198​7-1988

Memberships and Associations:

  • Member of the New Jersey Bar Association
  • Member of the Essex County Bar Association

Volunteer Work: 

  • Chair of the New Jersey Supreme Court Attorney Ethics Committee for Essex County, Distrist V-B (2015-2017)
    • Member since 200​7
  • Matrimonial Early Settlement Panelist (MESP) in Essex County (1990-present)
  • Lifelong active member of Our Lady of Sorrows Church in South Orange, NJ
  • Radio Reader for the Electronic Information and Education Service (EIES) in South Orange, NJ (2003-present)


Kelly M. Mattheiss, Esq.

Practice Areas