Sarah L. Monaghan, Esq. Of Counsel


SarahMs. Monaghan brings over thirty years of experience in New Jersey legal practice to Koester Law, LLC. Before that, she was of counsel to Dilts & Koester for many years. She practiced for ten years at a major New Jersey law firm, where she gained extensive experience in environmental law, including litigated matters, and transactional and regulatory matters. Since leaving the large firm to raise her family, Ms. Monaghan’s practice has focused on appellate work for the New Jersey Office of the Public Defender, where she provides all of her clients with personal, detailed and in depth service. At Koester Law, Ms. Monaghan’s practice has included commercial transactions, including formations of businesses, buy-sell transactions, commercial leasing, residential real estate transactions, and civil and commercial litigation.




New Jersey Office of the Public Defender, Office of Parental Representation – 2007 to present – Designated Appellate Attorney—all aspects of appeals of child welfare matters.

Riker, Danzig, Environmental Attorney – 1988-1998 – Regulatory, transactional and litigated matters for companies ranging in size from Fortune 500 to small family businesses.

The Metropolitan Corporate Counsel, Associate Editor – 2001-2006 – Member of editorial staff for national magazine for in-house counsel.


  • Rutgers Law School, Newark, New Jersey — J.D. with honors, 1988
    Computer and Technology Law Journal—Managing Notes & Comments Editor
  • College of William & Mary — B.A. in Government/History, 1983

Admitted To Practice

  • New Jersey
  • New Jersey Federal District Court


New Jersey Department of Child Protection & Permancy v. O.S., 2020 WL 3527322 (App. Div. June 20, 2020)

New Jersey Department of Youth & Family Services v. A.R., 405 N.J. Super. 418 (App. Div. 2009)

New Jersey Department of Youth & Family Services. V. C.P., 2012 WL 5356353, (App. Div., October 29, 2012)

New Jersey Department of Youth & Family Services v. P.H., 2013 WL 2120315, (App. Div., May 17, 2013)

Representative Projects

  • Multi-million dollar refinancing of large commercial facility
  • Drafted documents for reorganization of family-owned business
  • Negotiated lease and construction documents for new fitness center
  • Appeal of complex multi-trial child welfare case
  • Handled environmental issues related to Fortune 500 Company trivestiture of business units
  • ISRA filings for merger of two pharmaceutical companies
  • Environmental due diligence for sale of oil refinery
  • Multi-state due diligence for IPO of natural fertilizer manufacturer

Activities, Awards and Honors

  • Volunteer with Volunteer Lawyer for Justice – 2017 to present
  • Board Member of Family Connections – 2018-2017
  • President of Columbia High School Home & School Association—2011-2013
  • Over 15 years, held numerous other officer positions in Parent Teacher Associations and Home & School Associations for South Orange/Maplewood School District
  • Commissioner on the Village of South Orange Environmental Commission 1999-2005


Co-Author, “Working with Consultants in the ECRA Process,” Working with Environmental Consultants, Ed. David Machlowitz, J.Wiley & Sons, 1990


  • An eclectic mix of music from 1930s jazz through rock
  • Classic Movies
  • Reading about history
  • Cooking