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Abigail E. Marion

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Ms. Marion's practice spans a range of government investigations, white collar defense, and traditional commercial litigation. She has represented both plaintiffs and defendants, in disputes involving constitutional, antitrust, breach of contract, and insurance coverage claims and issues. Ms. Marion has also counseled clients in responding to a variety of inquiries from federal and state agencies. Through these representations, Ms. Marion has acquired substantial experience with clients in the healthcare and pharmaceutical spaces.

Ms. Marion earned her J.D. from Columbia Law School, where she was awarded the Jane Marks Murphy Prize for outstanding clinical work. Ms. Marion received her undergraduate degree from Tufts University, graduating with honors.

Ms. Marion is also admitted to practice in New York.


  • Columbia Law School, J.D. , Jane Marks Murphy Prize, Kent and Stone Honors
  • Tufts University, B.A., cum laude, International Relations and Art History

Representative Cases

  • Represented major pharmaceutical company in antitrust litigation relating to blockbuster drug, in multiple suits brought by competing manufacturer, indirect purchaser plaintiffs, and state and federal agencies
  • Represented policyholder in insurance coverage dispute relating to complex environmental remediation, successfully obtaining multi-million dollar recovery
  • Represented educational publisher in False Claims Act investigation brought by state attorney general
  • Represented drug manufacturer in vaccine-related inquiry brought by state attorney general
  • Represented large financial institution in federal investigation for potential exchange rate manipulation
  • Counseled startup in dispute regarding intellectual property in advertisements
  • Represented transgender patient pro bono in discrimination suit brought alongside the ACLU against state hospital, successfully establishing liability at summary judgment
  • Brought suit against Trump administration for attempted exclusion of undocumented immigrants from 2020 Census


  • Hon. Rosemary S. Pooler - U.S. Court of Appeals, Second Circuit
  • Hon. Wendy Beetlestone - U.S. District Court, Eastern District of Pennsylvania