David Grossbaum

About David

David Grossbaum is a mediator and arbitrator who has practiced law since 1985. He spent twenty years as a partner at Hinshaw & Culbertson LLP before retiring from the firm in December 2025. His legal career spans trial and appellate work, insurance coverage disputes, and the representation of professionals in liability matters.

David began his career as a law clerk to the Justices of the Massachusetts Superior Court, assisting with civil and criminal cases. He then served as a trial and appellate prosecutor for the Essex County District Attorney's Office, trying jury and non-jury cases and arguing numerous appeals before the Massachusetts Appeals Court and Supreme Judicial Court.

He earned his law degree from Boston College Law School, magna cum laude, and his undergraduate degree from the University of Vermont, cum laude.

Mediation & Arbitration Experience

David has served as an arbitrator and participated in countless mediations while representing clients throughout his legal career. He is a strong believer in the value of mediation as a way for parties to address disputes and develop workable resolutions.

David has mediated disputes involving election law, commercial contracts, landlord-tenant matters, trusts and estates, banking, intra-corporate disputes, and professional liability.

He received mediation training from the Community Dispute Settlement Center and his advanced summary process mediation training from MWI. He conducts mediations in various Massachusetts District and Municipal Courts, and is available for in-person and remote mediation through MWI.

His trial and appellate background provides a foundation for understanding disputed facts, evaluating evidence, and examining the legal issues that arise in mediation and arbitration.

Legal & Subject Matter Experience

David's practice focused on insurance coverage and professional liability matters involving lawyers, accountants, real estate agents, insurance agents, construction professionals, and securities brokers. He also represented clients in personal injury, products liability, and fidelity and surety bond matters.

Through his representation of professionals and insurers, he became deeply involved in underlying matters concerning business transactions, corporate law, construction, real estate, bankruptcy, domestic relations, patents, state and federal taxation, and trusts and estates.

David has also represented lawyers in disciplinary proceedings before the Board of Bar Overseers and has written and spoken extensively on insurance coverage, legal ethics, and legal malpractice.

Honors & Professional Activities

• Recognized as a Massachusetts Super Lawyer in professional liability defense for 17 years.
• Selected for inclusion in The Best Lawyers in America for Insurance Law from 2018 through 2027 and Legal Malpractice Defense from 2024 through 2027.
• Named a 2022 Top Lawyer by Boston Magazine in professional liability defense.
• Appointed by the Massachusetts Supreme Judicial Court to serve on the Standing Advisory Committee on the Rules of Professional Conduct.
• Appointed by the Board of Bar Overseers to serve as a hearing officer in disciplinary matters.
• Membership and leadership experience with the American Bar Association, Rhode Island Bar Association, and Professional Liability Underwriting Society.

Consumer Automotive Arbitration

MWI administers disputes between consumers and dealerships when the applicable automotive contract provides for arbitration through MWI. The parties have an opportunity to present information relevant to their dispute, and the arbitrator considers their submissions and issues a decision under the applicable contract and arbitration requirements.

Contact MWI's case manager to ask about David's availability for a matter. To begin a filing, visit MWI's arbitration filing page for instructions and required documents.