Skip to Main Content


Katharine Perry is a seasoned litigator with 27 years of experience and a reputation for effective representation in complex product liability, medical malpractice, insurance coverage, environmental, construction, infectious disease counseling, and toxic tort cases. She has won noted victories for her Massachusetts, regional and national corporate clients, including in 2017 successfully arguing an appeal before the Connecticut Supreme Court that reversed a verdict and clarified the expert evidence necessary to establish proximate cause.

Katie has built her toxic tort practice on a deep foundation of experience, serving on national asbestos litigation defense teams and coordinating complicated, multi-jurisdictional toxic tort litigation. She also claims federal and state jury trial experience in medical malpractice matters and has taught a Medical Malpractice Case Study at Northeastern University’s Legal Nurse Consulting Program in Boston. She has more than two decades of experience representing general contractors and subcontractors in third party claims, contract claims and environmental compliance matters. Within construction litigation, her clients have ranged from global companies to local community contractors. 

Her practice extends across New England, with bar admissions in Massachusetts, Connecticut, New York, Maine, Vermont, the US District Court of Massachusetts, the US District Court of Connecticut and the US District Court of Maine, as well as the US Supreme Court.

Katie resides in Hamilton, Massachusetts, with her husband and three children.


  • Wayne Bagley et al. v. Wyeth Holdings Corporation (SC 19835). In 2017, Katie successfully argued an appeal before the Connecticut Supreme  Court.   The Supreme Court agreed with Katie that at trial the plaintiff failed to prove through admissible expert testimony  that her client’s product was the proximate cause of the plaintiff’s injury.   The Supreme Court  reversed the judgment and remanded the case with direction to grant the defendant’s motion to set aside the verdict and for judgment notwithstanding the verdict. [Bagley Connecticut Decision]. 

  • Ronald Dummitt and Doris Kay Dummitt v. Elliott Company. On August 17, 2011, after a nine week trial before Judge Joan A. Madden in the Supreme Court of New York, County of New York, a jury returned a verdict in favor of the Plaintiffs. The jury found Elliott Company, AP&S' client, only 1% responsible. Plaintiffs alleged that Mr. Dummitt developed cancer as a result of exposure to asbestos while working in the United States Navy as a boiler technician from 1960 to 1977. As counsel for Elliott Company, Katharine argued that Elliott Company did not manufacture, supply or specify any of the asbestos-containing products at issue and did not breach any duty to warn. 

  • Kenneth Balthazar and Sandra Balthazar v. Foster Wheeler Energy Corp. On June 1, 2007, after a five-week trial, a Suffolk County jury returned the first Massachusetts defense verdict in an asbestos personal injury lawsuit in over 10 years. As co-counsel for Foster Wheeler, Katharine argued that her client did not breach any duty to warn Mr. Balthazar, who suffered from cancer resulting from asbestos exposure, of potential asbestos hazards in boilers supplied by Foster Wheeler for a Navy destroyer in 1949, and jurors concurred. 


  • Martindale-Hubbell Distinguished Attorney


  • American Bar Association
  • Defense Research Institute
  • Association of Defense Trial Attorneys
  • Mass Bay Girls Lacrosse League - Hamilton-Wenham Youth Lacrosse - U13 Coach


  • Suffolk University Law School, JD, 1996
  • Hobart and William Smith College, BA, 1993

Bar Admissions

  • Massachusetts
  • Connecticut
  • New York
  • Maine
  • Vermont

Court Admissions

  • US District Court, District of Massachusetts
  • US District Court, District of Connecticut
  • US District Court, District of Maine
  • US Supreme Court