Mark J. Oberstaedt

Partner

Overview

Mark serves as the Chair of the Business Litigation Group. Pragmatic and business-minded, Mark is an advocate for his clients in all aspects of trial and appellate work relating to commercial litigation and business disputes in the federal and state courts in New Jersey, Pennsylvania and other courts throughout the country. He also represents clients in private and public arbitration and mediation matters.

A highly-regarded trial lawyer, Mark has extensive experience handling many types of complex commercial litigation matters, including, among others, shareholder and partnership disputes; breach of contract litigation; breach of fiduciary duty and other tort matters; fraud and civil RICO (federal and state); corporate governance and shareholder rights litigation; franchise termination litigation; ERISA litigation; employee benefit matters; securities litigation; and protection of trade secrets and unfair competition. Mark represents national and international businesses, as well as small and medium-size companies.

Mark takes great pride in helping clients obtain the results they desire - particularly when the desired result seems unattainable. He is highly valued for his ability to put a strategy in play that considers all options for a successful outcome, including pre-dispute resolution, negotiated settlement, arbitration, or taking a case all the way to trial. Where settlement can achieve a client’s business goal, Mark understands the importance of timing in presenting their position and terms. He stays focused on his client’s objectives and provides an experienced, steady hand in all manner of sophisticated negotiations. In litigation, Mark is deeply invested in the outcomes for his clients and their businesses. He places a high value on creating efficiencies and thinking outside of the box when preparing their arguments. He becomes fully knowledgeable about all the underlying facts, takes control of the process, and keeps his clients informed at all times. Mark’s attention to detail and clarity of thought and purpose have netted positive results over the years and earned him many loyal client relationships.

Dedicated to community involvement, Mark volunteers his time to help produce local music festivals and benefit concerts, such as the Medford, NJ Oktoberfest & Music Festival, the Medford Celebrates Independence Day Fireworks and Concert, and the Raising Dignity Cabaret Benefit for Joseph’s House of Camden. He also created and operates House Concerts for a Cause, which matches musicians and charities to raise money through private house concerts.

Mark’s viewpoints on cutting-edge legal issues have appeared in publications such as Forbes, Bloomberg, the National Law Journal, Law 360, and others.

Representative Experience

Won $29M award for a footwear manufacturer in New York City arbitration against a major brand licensor for breach of an exclusive license agreement.
Won affirmative liability summary judgment, which led to sizeable settlement in action for breach of UCC requirements contract against one of the world’s largest envelope manufacturers.
Won multiple summary judgment motions leading to favorable settlement for in-patient, long-term care facility against insurance company.

Credentials

Education

Seton Hall University School of Law, JD, magna cum laude
Misericordia University, BA, summa cum laude

Admissions

New Jersey
Pennsylvania
U.S. Court of Appeals for the Third Circuit
U.S. District Court for the District of New Jersey
U.S. District Court for the Eastern District of Pennsylvania
U.S. District Court for the Middle District of Pennsylvania

Offices

Voorhees, NJ

Areas of Focus

View All Archer Services

Practice

News & Insights

View All

Senate Passes the Protect College Sports Act: What It Means for College Athletics and Institutions

09.30.2026

Blogs

Senate Passes the Protect College Sports Act: What It Means for College Athletics and Institutions

On September 28, 2026, the U.S. Senate passed the Protect College Sports Act (S. 4668) by a decisive bipartisan vote of 77-22. The bill now moves to the House of Representatives, and if passed by the House, to the President’s desk for signature....

Learn more

Archer & Greiner Wins NCAA Eligibility for Melvin Council Jr.

09.29.2026

Press Releases

Archer & Greiner Wins NCAA Eligibility for Melvin Council Jr.

Archer & Greiner, P.C. announced today that New York Supreme Court Justice Daniel J. Doyle granted a preliminary injunction against the NCAA and its President on behalf of client Melvin Council Jr., restoring his eligibility to compete in NCAA basketball during the 2026-27 season. Judge Doyle's ruling also prevents the NCAA from retroactively penalizing Council or any institution that chooses to add him to its roster....

Learn more

New Jersey’s LLC Default Rules May Surprise You

09.14.2026

Blogs

New Jersey’s LLC Default Rules May Surprise You

New Jersey’s Revised Uniform Limited Liability Company Act (“NJ-RULLCA”), N.J.S.A. 42:2C-1 et. seq., includes many default rules that courts will impose unless the operating agreement expressly states otherwise. The statute expressly empowers LLC members, with limited exception, by giving them the freedom to contract for the rules by which the entity will be governed. But where the members stay silent (intentionally or otherwise) and fail to address a particular matter in the operating agreement, NJ-RULLCA imposes default rules that courts will apply to resolve disputes. N.J.S.A. 42:2C-11(b). Many of those default rules may surprise unsuspecting members....

Learn more