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Mary F. Platt

Mary Platt represents clients in complex litigation matters pending before federal and state trial and appellate courts. In 2018, Mary served as Chancellor of the Philadelphia Bar Association after the Association’s membership elected her Vice Chancellor for 2016, and she served as Chancellor-Elect in 2017.

Mary’s practice has focused on defending companies in individual cases and class actions.  She has represented companies ranging from closely-held businesses to large global companies in a variety of industries, including the technology, pharmaceutical, chemical, oil and gas, and real estate industries.  She has experience in a wide variety of matters including contract claims, shareholder and partner disputes, antitrust claims, intellectual property, restrictive covenants, trade secret misappropriation, consumer protection and unfair competition claims, employment claims, real estate, environmental claims, insurance coverage, construction disputes, and toxic tort and product liability claims. She also has defended attorneys in malpractice cases and disputes arising from an attorney’s separation from their place of employment. As a Judge Pro Tem in the Philadelphia Court of Common Pleas Commerce Court Program, she serves as a mediator in settlement conferences at the request of Commerce Court Judges.

In addition to leading the Philadelphia Bar Association as Chancellor in 2018, Mary is a member of the Pennsylvania Bar Association’s House of Delegates, a member of the Jenkins Law Library Board of Directors, and has held several leadership positions at the Philadelphia Bar Association, including Assistant Treasurer, Treasurer, member of the Board of Governors, chair of the Law Practice Management Division, and chair of the Federal Courts, City Policy, and Women in Profession Committees.  Mary has served on the Philadelphia Bar Foundation Board of Trustees, the Public Interest Law Center Board of Directors, the Philadelphia Volunteers for the Indigent Board of Directors, the Global Philadelphia Association Board of Directors, and the Women’s Law Project Board of Directors.

An honors graduate of Georgetown University Law Center and an honors graduate of Mount Holyoke College, Mary spent 31 years as a litigator at Montgomery McCracken Walker & Rhoads in Philadelphia, where she was an equity partner for 22 years, a vice chair of the Litigation Department, and a member of the Professional Responsibility and Technology Committees.

Representative Matters

  • Represented a specialty chemical company in trade secret misappropriation litigation.
  • Represented a major oil company in a class action and hundreds of individual cases alleging personal injury and property damage arising from environmental contamination.
  • Represented a major software company in a class action arising from an allegedly defective product.
  • Represented a major telecommunications company in resolving a dispute with its landlord and general contractor over a significant construction defect at the client’s facility.
  • Negotiated separation agreement for a law firm shareholder.
  • Represented a specialty chemical company with respect to a third party subpoena seeking trade secrets and other confidential information pursuant to 28 U.S.C. § 1782.
  • Negotiated a separation agreement for a general counsel of a biotechnology company.
  • Served as counsel to a major software company in antitrust class actions brought by indirect purchasers of the company’s software in several states and Canada.
  • Represented major image distribution company in intellectual property litigation.
  • Represented a major pharmaceutical company in insurance coverage litigation.
  • Represented a commercial real estate company in landlord tenant disputes.
  • Represented attorneys in legal malpractice cases.
Martindale-Hubbell AV-Rated Preeminent Badge


  • J.D., Georgetown University Law Center
    cum laude
  • B.A., Mount Holyoke College
    cum laude

Bar and Court Admissions

  • Pennsylvania
  • New Jersey
  • United States Supreme Court
  • United States Court of Appeals for the Third Circuit
  • United States Court of Appeals for the Seventh Circuit
  • United States District Court for the Eastern District of Pennsylvania
  • United States District Court for the District of New Jersey
  • United States District Court for the Middle District of Pennsylvania


  • American Bar Association, Litigation Section
  • National Conference of Bar Presidents
  • Philadelphia Bar Association
  • Pennsylvania Bar Association
  • Lawyers Club of Philadelphia
  • Forum of Executive Women
  • Philadelphia Association of Defense Counsel
  • Brehon Law Society

Community/Civic Involvement

  • Phila. Bar Association, Elected Positions: 2018 Chancellor, 2017 Chancellor- Elect, 2016 Vice Chancellor, Assistant Treasurer – 2002, 2013-2015; Treasurer – 2003-2005; Member, Board of Governors – 1999-2001, 2002-2005, 2013-2015, 2016-2019
  • Jenkins Law Library, Member of Board of Directors – 2019
  • Phila. Bar Association Board of Governors, Appointed Member – 2008-2010
  • Phila. Bar Association, Chancellor’s Cabinet – 2002-2005, 2008, 2013-2015, 2016-2018
  • Phila. Bar Foundation, Member of Board of Trustees – 2016-2018
  • Phila. Bar Association Commission on Judicial Selection and Retention, Member – 2016-2018; Investigator – 2015
  • Philadelphia Volunteers for the Indigent Program, Member of Board of Directors – 2016-2018; Volunteer –1998-1999, 2001, 2005-2010, 2012-2018
  • The Public Interest Law Center, Member of Board of Directors – 2016-2018
  • Global Philadelphia Association, Member of Board of Directors – 2018
  • PA Bar Association, Member of House of Delegates – 2014-present
  • PA Bar Association Commission on Women in the Profession, Member –1993-2009, 2015-present
  • Women’s Law Project, Member of Board of Trustees – 1997-2012
  • Forum of Executive Women, Member – 1994-2003, 2017-present
  • Judge Pro Tem, Commerce Court, Court of Common Pleas of Philadelphia – 2005-present
  • Volunteer, Women’s Business Enterprise Council – 2011-2014
  • Chair, Phila. Bar Assn. Justice Brennan Distinguished Jurist Award Committee – 2003; Member –2016-2018
  • Co-Chair, Phila. Bar Assn. Law Practice Mgmt. Div. – 2009-2010; Vice Chair – 2008; Treasurer – 2007
  • Co-Chair, Phila. Bar Assn. City Policy Committee – 2007-2008
  • Chair, Phila. Bar Assn. Fidelity Bank (now PNC) Award Committee – 2007; Member – 2016-2018
  • Chair, Phila. Bar Assn. Civility Code Task Force – 2000
  • Chair, Phila. Bar Assn. Federal Courts Committee – 2000; Vice Chair – 1999
  • Co-Chair, Phila. Bar Assn. Committee on Women in the Profession – 1997-1998
  • Co-Chair, Phila. Bar Assn. Sandra Day O’Connor Award Committee – 1997-1998; Member – 2016-2018
  • National Association of Women Lawyers, Treasurer –1994; Assistant Treasurer – 1995


  • Philadelphia Business Journal Women of Distinction Award – 2019
  • Mount Holyoke College Alumnae Achievement Award – 2019
  • Selected for inclusion in Pennsylvania Super Lawyers® – 2006-07, and 2012 to the present
  • Rated AV Preeminent® by Martindale-Hubbell – 1995-present
  • Albert Nelson Marquis Lifetime Achievement Award – 2018
  • Selected by SmartCEO Magazine’s Legal Elite Readers Poll – 2011, 2012
  • Pennsylvania Bar Association Special Achievement Award – 1999

Selected Publications

  • Leaning In For All Philadelphia Lawyers, Mary F. Platt, 91st Chancellor of the Philadelphia Bar Association, Interview by Deborah Weinstein, The Philadelphia Lawyer, Winter 2018
  • Supporting and Connecting You with Our Philadelphia Legal Community, Philadelphia Bar Reporter, January 2018
  • Starting the Year With Member Engagement, Philadelphia Bar Reporter, February 2018
  • Marching Toward Women’s Equality in Our Profession, Philadelphia Bar Reporter, March 2018
  • Adding Value to Membership by Championing Legal Education, Philadelphia Bar Reporter, April 2018
  • Battle Continues to Fund LSC, Preserve Public Service Loan Forgiveness, Philadelphia Bar Reporter, May 2018
  • #MeToo’s Impact on Harassment in the Legal Profession, Philadelphia Bar Reporter, June 2018
  • Legislative Immigration Reform is Needed to Open the ‘Golden Door’, Philadelphia Bar Reporter, July 2018
  • Uniting to Help Curb Gun Violence, Philadelphia Bar Reporter, August 2018
  • Women Rising Up to Run for Office, Philadelphia Bar Reporter, September 2018
  • Association Adopts Strategic Plan, Philadelphia Bar Reporter, October 2018
  • Association Membership Supports Improved Access to Justice, Justice System, Philadelphia Bar Reporter, November 2018
  • Time to Say Good-Bye and Ask You to Renew Your Membership in the Philadelphia Bar Association, Philadelphia Bar Reporter, December 2018
  • 2018 Media Statements of Mary F. Platt, Philadelphia Bar Association Chancellor
  • Mary Platt became Chancellor-Elect of the Philadelphia Bar Assn. in 2017 and will be Chancellor of the Assn. in 2018, December 15, 2015
  • Mary Platt Joins Fineman Krekstein & Harris, P.C., October 14, 2014
  • Ten Tips from Outside Counsel On How to Reduce Outside Legal Costs, National Association of Minority and Women Owned Law Firms’ Newsletter, December 1, 2012
  • You Got Served: What to Do When Your Company Gets Sued
    SmartCEO Magazine, Vol. 3, No. 12 at 44, December 2012