Douglas M. Mansfield

Douglas M. Mansfield is a partner at Donahue, Tucker & Ciandella, PLLC, whose practice focuses on corporate and business law, employment and labor law, entertainment law, copyright law, and trademark law. He helps clients form, grow, manage, and sell businesses while working to prevent legal problems before they become costly disputes. His work includes contracts, leases, mergers, acquisitions, succession planning, workplace matters, privacy policies, data security, terms of use, and non-compete agreements for employers, owners, executives, and organizations across several regulated and service industries and operations.

Douglas completed his undergraduate education at the University of New Hampshire and earned his J.D. from Albany Law School of Union University. After admission to the New York and New Hampshire bars, he began his legal career as an Assistant Corporation Counsel with the New York City Law Department in Manhattan. That early government role gave him strong courtroom experience and practical insight into civil, criminal, municipal, and business-related disputes involving public agencies and private parties in difficult legal settings.

Douglas later served as General Counsel to the NYC Center for Animal Care and Control, Inc., a newly created organization with a large budget and many employees. In that role, he managed legal affairs involving employment, labor, corporate, contracts, municipal issues, negotiations, legislation, and enforcement matters. He also defended business interest disputes in federal and state courts, giving him experience with complex claims, organizational risk, workplace rules, contract problems, and public agency concerns during demanding institutional transitions and legal duties.

Douglas M. Mansfield helps people and organizations by giving clear guidance on business decisions, workplace rules, contracts, privacy duties, and legal risk. His clients benefit from his ability to connect legal advice with real operating needs, including growth plans, staff issues, transactions, and policy updates. He is admitted in New Hampshire, Massachusetts, and New York, and before several federal courts. His professional memberships and committee work reflect his continued focus on employment, business, nonprofit, privacy, transactional, and veterinary legal matters and planning.

Law Office Affiliations

• Partner, DTC Lawyers
• Member, Portsmouth Athenaeum
• Member, American Bar Association
• Member, Rockingham County Bar Association
• Member, Society for Human Resource Management
• Member, American Veterinary Medical Law Association
• Member, New Hampshire Bar Association’s Employment Labor Law Committee

Licensed State

• New Hampshire
• Massachusetts
• New York

Education

• Albany Law School
  Juris Doctor (JD)
• University of New Hampshire
  Bachelor of Arts

Awards & Badges