Contact Info
Phone: 617.426.5900
Email: mansfield@casneredwards.com

Areas of Experience
Civil Business Litigation: Antitrust, Business Tort, Commercial Contract, Education, Employment, Insurance, Professional Liability, Securities, and Tax Issues; White Collar Criminal Defense

Douglas Mansfield is a highly experienced litigator of business cases and other matters. He has successfully handled numerous trials, appeals, arbitrations, mediations, and administrative proceedings. He regularly practices in federal court and the Suffolk County Business Litigation Session, and he has also litigated business issues in Land Court, Superior Court, Probate Court, the U.S. Tax Court, and the U.S. Bankruptcy Court.

The range of business disputes Mr. Mansfield has litigated is broad. His practice includes representation of clients asserting or defending 1) contractual claims, involving, for example, business acquisitions, licenses, employment contracts and equipment sales; 2) intellectual property claims, particularly including matters involving trade secrets; 3) employment claims, including claims of discrimination, wrongful termination, and breach of noncompetition covenants; 4) professional malpractice claims, principally the defense of lawyers, accountants, architects and engineers, but also including investment advisors and real estate appraisers; 5) securities claims, including arbitration of claims by brokerage customers and defense of parties in class actions; 6) antitrust claims; 7) fiduciary duty claims, and 8) claims involving nonprofit entities.

A former federal prosecutor, Mr. Mansfield also represents clients who are the subject of white collar grand jury investigations into matters involving, for example, defense contractor fraud, tax fraud, health care fraud, securities fraud, or antitrust violations.

Mr. Mansfield attended Harvard College and Columbia Law School. At Columbia he was an editor of the Columbia Journal of Law and Social Problems, and he was a Harlan Fiske Stone Scholar. Upon graduation, he was admitted to the New York bar, and he served as an Assistant United States Attorney in the Eastern District of New York. Mr. Mansfield is a partner in Casner & Edward's Litigation Department. He is a member of the Massachusetts and New York bars and of the bars of the related federal courts, including the United States Supreme Court.

Mr. Mansfield’s public service has included participation on the District of Massachusetts Criminal Justice Act Panel and involvement in town government.