ATTORNEYS

CHRISTOPHER R. LAVOIE, ESQ.

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CHRISTOPHER LAVOIE is the managing partner at Dunn and Dunn. He is a trial attorney whose practice focuses on the defense of complex litigation, including medical malpractice, nursing home, general liability, personal injury and premises liability cases. His practice includes representing clients in both State and Federal Court. Mr. Lavoie also has experience representing healthcare providers before their boards of registration and advising healthcare providers on regulatory, credentialing and peer review issues. Mr. Lavoie is a frequent lecturer to healthcare professionals and has tried many cases in the Massachusetts Courts.

Mr. Lavoie is admitted to practice law in the Commonwealth of Massachusetts, the U.S. District Court for the District of Massachusetts, the State of New Hampshire, the U.S. District Court of New Hampshire, the State of Rhode Island and the U.S. District Court of Rhode Island.

Mr. Lavoie is a 1994 graduate of the University of Chicago and 1997 graduate of Suffolk University Law School where he served as Managing Editor of the Suffolk University Law Review. Mr. Lavoie currently lives in Cambridge, Massachusetts.

MATHEW G. DUNN, ESQ.

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MATHEW DUNN joined Dunn & Dunn in 2007 and is a Partner at the firm. Attorney Dunn focuses his practice on the defense of healthcare professionals and institutions in medical and professional liability cases in all Courts in MA and NH, as well as before their overseeing administrative boards, agencies, and commissions.

Attorney Dunn has successfully represented providers at all stages of the process before the Courts, the Boards of Registration in Medicine, Nursing, and Dentistry, as well as the Disabled Persons Protection Commission, Massachusetts Commission Against Discrimination, and Department of Children and Families. Attorney Dunn also advises clients in the areas of processional licensure, risk management, and compliance. Additionally, he represents and advises clients in nontraditional judicial proceedings including criminal and family related matters.

Attorney Dunn has also successfully litigated matters before the Massachusetts Appeals Court, including Gorham v. Jordan Hospital, et al., 84 Mass. App. Ct. 1125, 999 N.E.2d 503 (2013) and Reed v. Newburger, et al, 92 Mass. App. Ct. 1104, 87 N.E.3d 1202 (2017), review denied, 478 Mass. 1110 (2018).

Attorney Dunn is admitted to practice law in the Commonwealth of Massachusetts, the State of New Hampshire, and the U.S. District Courts for the District of Massachusetts and the District of New Hampshire.

In connection with his employment, Attorney Dunn was named a Top Lawyer by Boston Magazine in 2021 and 2022.

Prior to his employment at Dunn & Dunn, he served as an Assistant District Attorney in Suffolk County. During this employment he was involved in the Community Based Juvenile Justice program and the Changing Lives Through Literature program.

Mathew Dunn is a graduate of the University of New Hampshire (B.A., 2003) and New England School of Law (J.D., 2006). While attending the New England School of Law he received the CALI Excellence Award for being the highest-ranking student in the course of Criminal Advocacy. Outside of work, Attorney Dunn is an avid tennis player, having played in high school and college.

ALLYSON N. HAMMERSTEDT, ESQ.

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Allyson N. Hammerstedt is a skilled attorney and seasoned litigator, having successfully defended clients in state and federal courts throughout Massachusetts and Rhode Island. Attorney Hammerstedt focuses her practice on the representation of healthcare professionals and institutions in medical malpractice actions and before regulatory boards, agencies, and committees. Her current areas of practice also include healthcare law, product liability, privacy and HIPAA compliance, premises liability, commercial litigation, personal injury and appellate work spanning from minor to catastrophic injuries and death.

Attorney Hammerstedt has experience in all phases of litigation including pre-suit investigations, motion practice, discovery, depositions, summary judgment, trial, and appeals. She has a strong interest in and experience with alternative dispute resolution and Communication, Apology and Resolution (CARe) programs. Her time working in-house at a local academic medical center enriched her unique insight into supporting and defending the delivery of healthcare. Attorney Hammerstedt is a frequent presenter to healthcare associations, hospital committees and Grand Rounds, clinical groups and risk management programs on medicolegal matters, healthcare ethics and developing legal and regulatory issues within the healthcare space. She has also served as a guest lecturer on hospital law at New England Law | Boston. Prior to joining Dunn & Dunn, P.C. Attorney Hammerstedt worked with a local defense firm, where she focused her practice defending caregivers in malpractice actions and before regulatory boards.

Attorney Hammerstedt is a graduate of New England Law | Boston (J.D.) and The Catholic University of America (B.A.) where she earned a Bachelor of Arts (B.A.) in Political Science with minors in Philosophy and French. She is admitted to practice in the Commonwealth of Massachusetts, the United States District Court for the District of Massachusetts, Rhode Island, the United States District Court for the District of Rhode Island, the United States Court of Appeals for the First Circuit, and the United States Supreme Court. In 2022, Ms. Hammerstedt completed a Fellowship in Bioethics at Harvard Medical School, which included an academic appointment in the HMS Department of Global Health and Social Medicine.

In 2018, Ms. Hammerstedt successfully argued before the Massachusetts Supreme Judicial Court in Polanco v. Sandor, M.D. (SJC-12389), which is the landmark decision holding that a surety bond in the face amount of the statutory requirement is not the ‘equivalent’ in cash for purposes of G.L. c. 231, §60B. The same year, she was named a Lawyer of the Year by Massachusetts Lawyers Weekly. In addition, she has been recognized as a “Rising Star” in Boston Magazine and New England Super Lawyers in Personal Injury – Medical Malpractice Defense based on a vote of licensed attorneys in the state and a review by an independent blue-ribbon panel.

Other reported decisions:

• Adams v. Stone, et al., 87 Mass. App. Ct. 1123; 31 N.E.3d 77 (2015) holding that an expert opinion for purposes of a medical malpractice tribunal is insufficient where the expert fails to consider the patient’s delay in seeking treatment and failure to follow providers’ recommendations for further care.

• De Gonzalez v. Harder et al., 86 Mass. App. Ct. 1107; 13 N.E.3d 1027 (2014) holding that an expert opinion for purposes of a medical malpractice tribunal is insufficient where the expert makes a generic, conclusory statement and fails to state with specificity the applicable standard of care required.

• Cote v. Roodhouse et al., 86 Mass. App. Ct. 1112; 16 N.E.3d 526 (2014) holding that an expert opinion for purposes of a medical malpractice tribunal is insufficient where the expert’s opinion is based on assumption of facts that have no roots in the evidence

CAROLINE LIEDER COLLITON

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CAROLINE LIEDER COLLITON joined the firm of Dunn & Dunn in May, 2022 and focuses her practice in medical malpractice defense and general liability. She represents hospitals, physicians, nurses, and other healthcare professionals in malpractice claims and before state licensing boards. Prior to joining Dunn & Dunn, Ms. Colliton practiced insurance defense at a boutique Boston law firm litigating complex personal injury and premises liability claims. She is an experienced trial lawyer and has achieved numerous defense verdicts on behalf of her clients.

Ms. Colliton is a graduate of the University of New Hampshire and New England Law | Boston. While in law school, she served as a legal intern for a non-profit legal services center assisting immigrants, refugees, and victims of domestic violence. She is licensed to practice in New Hampshire, the Commonwealth of Massachusetts, and United States District Court for the District of Massachusetts.

JORDAN D. SPIEGEL

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JORDAN D. SPIEGEL joined the law firm of Dunn and Dunn in April of 2023. Attorney Spiegel was most recently an associate in the Boston office of Morrison Mahoney where he concentrated his practice in the areas of medical malpractice defense and represented hospitals, physicians, nurses and other health care professionals in both medical malpractice claims and Medical Board disciplinary matters.



Prior to joining Morrison Mahoney Mr. Spiegel worked for Liberty Mutual Insurance Co. as staff counsel where he specialized in Workers’ Compensation, auto-liability, and general liability. Mr. Spiegel also has experience in the field of Social Security Disability where he has represented disabled and low-income individuals seeking disability benefits. During Mr. Spiegel’s career as a litigator, he has served as lead trial counsel on numerous trials and has achieved defense verdicts and favorable outcomes for his clients.



Mr. Spiegel graduated with a Bachelor’s from Clark University. He graduated with a Juris Doctor from New England Law (cum laude). During law school he achieved the New England Scholar Award which is given to those students in the top ten percent of their class for the academic year. Attorney Spiegel participated in an externship program at the International Criminal Court in The Hague, The Netherlands, where he was a law clerk in the Appeals Chamber, the highest appellate level of the court. During law school he also interned in the Suffolk County District Attorney’s Office where he was able to argue cases in open court under Judicial Rule 3:03, which allows select students to do so.