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Kaspar Stoffelmayr

Bartlit Beck

Kaspar Stoffelmayr is a litigator and trial lawyer at Bartlit Beck in Chicago. He has extensive background in mass tort, product liability, and class action defense, as well as in prosecuting and defending commercial disputes. In addition to successful courtroom advocacy, his experience includes the development of creative litigation and resolution strategies, the efficient management of large teams in mass litigations, and working with clients to address the public relations, regulatory, marketplace, and other issues that can arise in connection with a major litigation. From 2011 to 2014, Kaspar took a leave of absence from the firm to serve as Vice President and Associate General Counsel at Bayer Corporation, where he was the head of litigation, managing the function that handled major U.S. litigation matters of Bayer Group companies, including Bayer HealthCare, Bayer MaterialScience, and Bayer CropScience. In that capacity, he had overall responsibility for developing and implementing the company’s defense strategies for a large docket of product liability and mass tort cases, class actions, and a variety of other matters.


  • Opioids Litigation: Lead counsel and trial counsel for Walgreens in nationwide litigation relating to the distribution and sale of prescription opioid medications, including over 2,500 cases brought by states, cities, counties, tribes, and private parties seeking recovery in connection with the opioid abuse crisis. MDL in the Northern District of Ohio and a large number of related cases pending in other state and federal courts. Liaison counsel for all chain pharmacy defendants in the MDL.
  • Confidential Pharmaceutical Industry Arbitration: Lead counsel and trial counsel for a major pharmaceutical company in the confidential arbitration of a commercial dispute with another large pharmaceutical manufacturer. Case won.
  • YAZ/Yasmin Product Liability Litigation: Lead counsel for Bayer in nationwide product liability litigation alleging personal injuries caused by the oral contraceptives YAZ and Yasmin. MDL in the Southern District of Illinois and large coordinated state-court proceedings in California, New Jersey, and Pennsylvania. No adverse judgments among approximately 20,000 lawsuits and claims resolved on motions to dismiss or summary judgment, voluntary dismissals, and settlements.
  • Xarelto Product Liability Litigation: Represented Bayer in lawsuits alleging personal injuries caused by the novel oral anticoagulant Xarelto.
  • Confidential Telecommunications Arbitration: Lead counsel and trial counsel for a major cable company in the confidential arbitration of a contract dispute with an internet technology vendor. Case won.


  • The University of Chicago Law School, 1996, J.D., with High Honors
    • Order of the Coif
  • University of Washington, 1993, M.A.
    • Grinnell College, 1991, B.A., with Honors
    • Phi Beta Kappa


  • Honorable A. Raymond Randolph, U.S. Court of Appeals for the District of Columbia Circuit, 1996-1997