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William Boesch
Chair, Professional Liability Group
Chair, Intellectual Property Litigation Group

William L. Boesch


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William Boesch
Chair, Professional Liability Group
Chair, Intellectual Property Litigation Group
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William has over 25 years of trial and appellate experience in Massachusetts, other New England state and federal courts, and beyond. He advises insurance companies and policyholders in complex coverage matters, and represents insurers in coverage and bad-faith litigation in the trial courts and on appeal. He also represents accountants, lawyers and other professionals in malpractice cases, and helps individuals and businesses with disputes about technology, intellectual property, and other complex matters.

William’s excellence as a counselor and litigator comes from being genuinely attentive and accessible to his clients, from analytical and organizational skill, from lucidity, creativity and sensitivity as a legal writer and strategist, and from passion and clear-headed focus in the courtroom.

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  • Summary-judgment wins in Vermont federal court for insurers of nursing home and estate-planning lawyer
  • Settlement for co-founder of search-technology company of claim involving alleged improper termination
  • Amicus brief for land-trust organization in appeal involving unlawful removal of trees
  • Settlement of complex multi-party insurance dispute arising from housing-development class action
  • Settlement for medical practice of claim of responsibility for doctor’s sexual misconduct
  • Settlement of family dispute over handling of trusts and real-estate interests
  • Reversal of benefits-insurer’s decision to deny claim by parents of employee who died in automobile fire
  • Settlement of accountant-malpractice claim involving audit of public housing authority
  • Summary-judgment win for insurer of home inspector in claim for failing to settle buyer’s claim
  • Successful resolution of SEC ethics charges against accountant-auditor
  • Victory in suit for injunction against website personally attacking lawyer
  • Settlement of malpractice dispute between large law firm and university over handling of construction dispute
  • Settlement of malpractice dispute between accounting firm and entrepreneur over alleged missed tax benefits
  • Summary-judgment win for professional-liability insurer in dispute over claim seeking return of $215 million in contingent fees from securities class action
  • Summary-judgment win for accounting firm in suit by owner of restaurant group
  • Successful resolution for liability insurer of suit alleging improper refusal to settle sexual-harassment case
  • $1.13 million award in arbitration of fee dispute between tax consultants and defense contractor
  • Summary-judgment victories for professional-liability insurer in federal cases involving coverage for lawyers caught in check scams
  • Settlement for medical-device inventors of patent-licensing dispute with manufacturer
  • Settlement of legal malpractice claim arising from $52 million commercial arbitration award in trademark-licensing dispute
  • Settlement for umbrella insurer of claim against primary carrier for mishandling defense of insured and failing to settle
  • Defense through jury trial and appeal of Fortune 500 technology company in trademark dispute with Massachusetts software maker
  • Jury verdict for patent lawyers in malpractice case arising from dispute over biotech patent
  • Jury verdict for owners of Irish pubs in trademark dispute with major hotel chain. One of Massachusetts Lawyers Weekly’s “biggest defense wins” of the year
  • Arbitration victory for tax accountant in dispute with prominent author-clients after audit
  • Pre-trial dismissal of defective-design product liability lawsuit brought by quadriplegic plaintiff against office-furniture maker
  • Substantial settlement on behalf of family of HVAC worker who suffocated inside walk-in freezer
  • Favorable resolution for inventor of dispute with medical-device company over alleged breach of disclosure agreement
  • Dismissal of suit against aluminum-can manufacturer alleged to have violated equipment lease
  • Jury verdict for bank’s general counsel accused in malpractice case of withholding information about pending loan application
  • Summary judgment for law firm charged with malpractice for improper drafting of release in tort case
  • Successful jury-trial defense of liquid-propane valve manufacturer against product liability claims by tank-truck operator severely injured in explosion
  • Jury-trial win on behalf of ferry passenger who fell down flight of stairs and suffered debilitating knee injury
  • Disputes involving defective-design products claims addressed to stationary power woodworking tools, heating-system controls, large appliances, conveyor systems, construction cranes, and pneumatic tire-changing machines
Community Presence
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  • Boston Bar Association
  • Defense Research Institute (DRI) (Insurance Law and Professional Liability Committees)
  • American Bar Association Lawyers’ Professional Liability section
  • Professional Liability Underwriting Society (PLUS)
Professional Recognition
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  • Massachusetts Super Lawyers
  • Best Lawyers in America
  • Martindale-Hubbell, “AV-Preeminent” Rating