Marissa Parker

Marissa Parker


Marissa Parker represents corporate, nonprofit and institutional clients in state and federal court and private arbitration. With a strong background in business litigation, Marissa brings a practical, results-oriented approach to resolving complex, sophisticated matters. Her practice spans patent infringement actions, merger and acquisition disputes, securities litigation and derivative suits, ERISA claims, and protection of institutional first amendment rights.

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Representative Matters

  • representing more than 100 mutual funds and institutional investors as plaintiffs in securities fraud opt-out actions against Petrobras arising from the Brazilian oil industry giant’s long-running bribery and kickback scheme and overstatement of assets
  • obtained a unanimous arbitration award for specific performance of sellers’ post-closing contingent payment obligations arising out of client-buyer’s $60 million acquisition of a global apparel labeling business
  • obtained a multimillion dollar settlement on the night before the trial for local manufacturing company in a merger and acquisition dispute with global packaging company
  • defended STMicroelectronics, a Swiss-based semiconductor company, against patent infringement claims relating to transistor design in high-speed integrated circuits
  • defeated an emergency application for temporary restraints brought by 42 providers against a UnitedHealth Group managed care organization seeking to enforce the terms of its provider contracts
  • obtained dismissal of a RICO and tortious interference lawsuit brought against SPX Corporation subsidiary in the business of manufacturing of industrial ventilation equipment
  • vindicated business judgment of Invesco mutual funds and their special litigation committee by securing dismissal of derivative lawsuit challenging redemptions of auction rate preferred securities
  • defended Ivera Medical Corporation, a California-based medical products company, in a series of related cases against patent infringement claims and validity challenges to patents concerning disinfecting products
  • secured the full release and dismissal of third-party claims against a wastewater treatment company with zero contribution to multiparty, six-figure settlement underlying a Clean Water Act suit between the municipality and the U.S. Environmental Protection Agency
  • obtained a reversal on appeal of an agency’s denial of a financial hardship exemption for a nonprofit entity to demolish an historically designated building
  • defended UnitedHealth Group’s managed care organizations in dozens of evidentiary hearings involving challenges to due process and medical necessity determinations underlying the denial or reduction of Medicaid benefits
  • contributed to numerous state and federal appellate, trial, and amici briefs on the scope and applicability of the First Amendment to regulation of religious institutions, and on assorted issues under state and federal constitutional law arising in litigations against religious institutions
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Bar Admissions
  • New Jersey
  • New York
  • Pennsylvania
Court Admissions
  • Pennsylvania Supreme Court
  • U.S. District Court for the Eastern District of Pennsylvania
  • U.S. District Court for the District of New Jersey
  • U.S. District Court for the Southern District of New York
  • J.D., cum laude, Temple University Beasley School of Law
  • B.A., Brown University

  • Board of Directors, Minds Matter of Philadelphia
  • Executive Committee, Brown Alumni Club of Philadelphia
  • Greater Philadelphia Chamber of Commerce, Young Professionals Network
  • Host Committee Chair, Back on My Feet Annual Bash


  • The Legal Intelligencer, "Lawyers on the Fast Track"
  • Leadership Council on Legal Diversity (LCLD) Fellow
  • Forum Of Executive Women’s Mentoring Program Graduate
  • United Way’s Young Leaders Program Graduate
  • Pennsylvania Super Lawyers, Rising Star
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