Mary Kay’s practice is focused on business litigation. She has successfully represented clients in federal and state courts throughout the country and in private and industry arbitrations and mediations. Her practice covers a wide range of business matters including theft of trade secrets, unfair competition and covenants not to compete.  She also handles intellectual property matters, including copyright and trademark infringement, and corporate governance and control issues such as shareholder and partnership disputes, breach of fiduciary duty claims, and director and officer as well as other professional liability claims. Mary Kay also regularly handles general commercial contract disputes, real estate-related litigation and financial institutions litigation. She also has a depth of experience in defamation, fraud and civil rights matters. Mary Kay has significant experience with electronic discovery and has written and lectured on this developing area of the law.

For the last 14 years, Mary Kay’s peers have selected her as a Pennsylvania Super Lawyer®, an honor conferred upon the top 5% of lawyers in Pennsylvania (2007-2021)


  • Pennsylvania Bar Association
  • Philadelphia Bar Association, Women in the Profession Committee


Rutgers University Law School, J.D. with high honors, 1988

Douglass College, B.A. with high honors, 1983

Bar & Court Admission

United States Supreme Court

United States Court of Appeals for the Third Circuit

United States District Court for the Eastern District of Pennsylvania

United States District Court for the Middle District of Pennsylvania

United States District Court for the Western District of Pennsylvania

United States District Court for the District of New Jersey

Commonwealth of Pennsylvania

State of New Jersey

  • Prosecution of fraud, civil conspiracy and aiding and abetting claims against two Am Law 100 law firms and a global appraisal firm in connection with a multi-million dollar investment in real estate.
  • Represented major real estate developer in defense of fraudulent transfer litigation seeking recovery of $20 million arising from the Arthur D. Little bankruptcy case in Massachusetts.
  • Successfully defended of multi-million dollar claim against supplier of commercial goods under Article 2 of the UCC, and secured judgment against plaintiff on counterclaim.
  • Prosecuted confession of judgment action and defense of lender liability claim resulting in complete recovery of debt as well as an award of $500,000 in attorneys’ fees.
  • Successfully defended of a restrictive covenant claim in nuclear power consulting field.
  • Successfully prosecuted breach of contract claim in favor of clinical research organization against foreign sponsor of clinical trial and recovered full judgment amount.
  • Successfully prosecuted claim of financial advisor against former employer for $1.1 million in commission and capital in the business.
  • Defeated a motion for preliminary injunction sought by W.L.Gore & Associates in U.S. District Court in Maryland against a former employee alleged to have misappropriated trade secrets.
  • Represented University Dean in securing severance benefits.
  • Successfully represented national IT staffing company in action against former president who sold his company to the client and then formed and “incubated” directly competitive businesses by stealing key management personnel and utilizing company resources.
  • Successfully represented clients in major copyright cases, securing both monetary settlements and a consent order that client owned and had validly registered its copyright and was the original author of the infringed work.
  • Represented Department of Human Services in class action case alleging that the Department’s policies and procedures, and implementation thereof, violated constitutional rights of the youth in its care.
  • Represented maker of automotive parts in a $53 million replevin action to obtain critical tooling necessary to prevent shut down of vehicle manufacturing lines.
  • Represented financial institution in borrower lawsuit alleging breach of contract and conversion which concluded with the voluntary withdrawal of the complaint against the bank.
  • Won a preliminary injunction for a franchisor prohibiting franchisee from opening competing business in or around surrounding territory.
  • Successfully represented major coal client in contract dispute for long-term supply of coal including a favorable settlement on the client’s counterclaim.
  • Defense of numerous ERISA matters for large east coast financial institution.
  • Successfully defended Pennsylvania Wage Payment and Collection Act cases for a number of companies, including those located both inside and outside the Commonwealth.
  • Achieved favorable settlement for investors in real estate transaction where $1 million deposit was wrongfully released from escrow and the deal never closed.
  • Successfully defended construction manager of school project whereby manager was not only released from all claims but also indemnified by plaintiff school board for attorneys’ fees incurred in defending case.
  • Obtained favorable arbitration award for founder of financial investment business who was the subject of a majority shareholder freeze out.
  • Achieved significant settlement for Maine jewelry artist against national jewelry company for copyright infringement.
  • Represented Montgomery County in Wage and Hour action brought by class of corrections officers concerning time spent for roll call and doff and don.
  • Represented Montgomery County in Wage and Hour Act action brought by class of nursing home skilled nurses asserting a miscalculation of overtime.

Super Lawyers® 2021

Mary Kay Brown has been named to the Pennsylvania Super Lawyers® list for 2021 as a Top Rated Business Litigation Attorney.  Mary Kay has held this honor since 2005.  Congratulations, Mary Kay!

Read More


Families First Coronavirus Response Act. Here is what you need to know.

On March 18, 2020, the President signed the Families First Coronavirus Response Act (“FFCRA”) into law.  The information contained herein comes from the text of the FFCRA as well as a Department of Labor posting guidance dated March 24, 2020. For DOL Q&A, click here. The FFCRA establishes a right to paid sick leave for…

Read More

POSTED IN: Client Alerts, News

Super Lawyers® 2019

Mary Kay Brown has been named to the Pennsylvania Super Lawyers® list for 2019 as a Top Rated Business Litigation Attorney.  Mary Kay has held this honor since 2005.

Read More