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Marguerite S. Walsh focuses her practice on representing companies, as both plaintiffs and defendants, in matters involving protection of intellectual capital and customer relationships. A trusted litigator and advisor who provides clients with strategic and practical solutions for these critical business needs, she combines her expertise with superior client service and high-quality work to handle a wide spectrum of matters, including:

  • Litigating all aspects of cases involving trade secrets and post-employment restrictions, from the investigation stage through TRO/preliminary injunction, discovery, trial and appeal
  • Helping clients reach settlements that result in positive business outcomes
  • Counseling clients regarding the drafting, enforcement and defense of agreements containing post-employment restrictions
  • Counseling clients faced with hiring individuals with post-employment restrictions in a manner designed to minimize risk
  • Developing programs and systems that help prevent the theft of confidential information and trade secrets

Marguerite has specific experience with claims arising under the common law of many jurisdictions, as well as state-specific applications of the Uniform Trade Secrets Act. Marguerite is also well-versed in the Computer Fraud and Abuse Act and related statutes, as well as issues surrounding preservation and production of electronic evidence.

In addition to her unfair competition practice, Marguerite also regularly litigates and counsels on behalf of companies facing discrimination, retaliation and wrongful discharge claims, in both the individual and class action context, under Title VII, the Age Discrimination in Employment Act, the Americans with Disabilities Act and related statutes. She has tried age and disability discrimination, and retaliation cases to verdict and has litigated many other matters at all stages, from the initial agency charge to summary judgment to the eve of trial. She has also handled appeals of such matters.

Working with a diverse group of clients, Marguerite represents companies in the following industries:

  • Pharmaceutical
  • Manufacturing
  • Financial services
  • Health care
  • Medical devices
  • Staffing
  • Aerospace
  • Consumer and industrial products
  • Technology
  • Management consulting
  • Retail

Marguerite is a frequent speaker, particularly in the area of trade secrets and unfair competition. She was a lecturer at the National Institute for Trial Advocacy Jury Trial Program and served as a faculty member at the University of Virginia Trial Advocacy Program for two years. She also served as an adjunct professor at Villanova University teaching an undergraduate level honors seminar.

Co-chair of Littler Mendelson's Competition and Trade Secrets Practice Group, Marguerite is also a member of the Management Committee. Marguerite chairs the Legal Content Advisory Committee, is a core member of the firm's Women's Leadership Initiative and serves on the firm's Governance Committee. She also served on the Board of Directors and the Strategic Planning Committee.

Before joining Littler in 2001, Marguerite worked at other law firms as a shareholder, partner and associate.


  • Member, Labor and Employment and Litigation Sections - American Bar Association
  • Past Member, Council, Civil Litigation Section - Pennsylvania Bar Association
  • Past Member, Commission on Women in the Profession - Pennsylvania Bar Association
  • Past Member, Gender Bias Subcommittee, Pennsylvania Supreme Court Committee on Gender and Racial Bias in the Courtroom - Pennsylvania Bar Association
  • Past Member, Business Litigation Committee's Task Force on Discovery - American Bar Association
  • Member, Board of Directors - Rosemont School of the Holy Child
  • Former Board Member, Center for Literacy
  • Former Board Member, Woodlynde School


  • Named, The Best Lawyers in America©, 2009-2015
  • Named, Pennsylvania Honor Roll of Women
  • Named, Women to Watch - Business Philadelphia
  • Awarded, Martindale-Hubbell AV® Peer Review Rating