Born in Boston and raised in Dedham, Justice Marguerite T. Grant graduated from Wellesley College with a degree in history and Latin and earned her Juris Doctorate from Stanford Law School where she was managing editor of the Stanford Law Review.
Justice Grant began her legal career in 1988 as a litigation associate at Hill and Barlow, P.C. in Boston. In 1991, Justice Grant joined the Middlesex County District Attorney's Office, where she worked as an appellate prosecutor for twenty years. In 2011, she joined the Norfolk County District Attorney's Office, and was promoted in 2014 to General Counsel and Director of Training. In this role, Justice Grant advised the District Attorney on legal and ethical issues, trained prosecutors on legal and ethical obligations, and argued primarily homicide and sexual assault cases in the Commonwealth's appellate courts.
Justice Grant has also taught professional responsibility at Suffolk University Law School, appellate advocacy at Northeastern University School of Law, and legal writing at Harvard Extension School.
Justice Grant is a member of the Supreme Judicial Court's Committee on Model Jury Instructions on Homicide. She has been a trustee of the Massachusetts Bar Foundation since 2017. She was previously a member of the Board of Bar Overseers, serving as its chair from 2007 until 2008. She also served on the Board of Editors of Massachusetts Lawyers Weekly from 2016 to 2020.
Justice Grant was appointed to the Appeals Court by Governor Charles Baker in October, 2020.