John B. Koss

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  • Boston University School of Law (JD)
  • Northwestern University (BA)
  • Northwestern University (MS, Journalism)

Bar Admissions

  • Massachusetts
  • New York
  • First Circuit Court of Appeals
  • United States District Court for the District of Massachusetts


  • Spanish

John’s practice focuses on product liability and complex tort litigation. John is also a founding member of Mintz Levin’s Electronic Discovery Practice Group and serves as Practice Coordinator for this Group. John is a member of Mintz Levin’s Hiring, Pro Bono, and Diversity Committees.

John has a diverse litigation and counseling practice with a particular focus on products liability and contract and licensing disputes for life sciences companies. Particularly, John serves as national coordinating, strategy, and discovery counsel for pharmaceutical clients involved in serial litigation. In this role, John advises on liability minimization and prevention strategies as well as information governance and the design and execution of company-wide and multinational discovery plans. John writes and speaks regularly on discovery law and practice in state and federal courts.

John has extensive pro bono experience advising victims of domestic violence and organizations that serve these victims in privacy matters, subpoena compliance, and information governance.  

Outside of the office, John is a part-time faculty member at Boston University School of Law, where he teaches the Legal Research and Writing Program.

Representative Matters

  • Currently representing a publicly traded biotechnology company as national coordinating, strategy, and discovery counsel in product liability disputes initiated in various state, federal, and international courts involving two FDA-approved pharmaceutical drugs for the treatment of lymphoma and multiple sclerosis. 
  • Successfully represented a publicly traded biotechnology company in a wrongful death action brought in state court by the estate of a patient who died following post-market treatment with an FDA-approved pharmaceutical drug.
  • Successfully represented and managed discovery for a leading biotechnology company in a claim brought pro se by a patient who alleged to have suffered an adverse reaction to a placebo formula during participation in a clinical trial study.
  • Successfully obtained a favorable settlement for a publicly traded diagnostic manufacturer in a “bet the company” arbitration premised on claims that the manufacturer’s licensee had failed to develop the manufacturer’s microRNA-based products as required by the governing licensing agreement.
  • Successfully advised a publicly traded pharmaceutical company with respect to divestment of its cardiovascular research and development pipeline as well as a favorable wind-up of an associated collaboration with another pharmaceutical company.
  • Successfully obtained declaratory relief for a publicly traded biotechnology company in an arbitration brought against a collaboration partner seeking to withhold decision-making and development rights in contravention of the governing collaboration agreement associated with a multibillion-dollar FDA-approved treatment for cancer and rheumatoid arthritis. 

Recognitions & Awards

  • Up & Coming Lawyer, Massachusetts Lawyers Weekly and Massachusetts Bar Association (2012)
  • Massachusetts Super Lawyers: Rising Star – Business Litigation (2011 – 2014)

Professional & Community Involvement

  • Member, Fenway Health Board of Directors
  • Member, Steering Committee of the Young Leaders Council, Fenway Health
  • Member, Boston Area Rape Crisis Center (BARCC) Board of Directors

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