Jennifer May Allen was ceremonially sworn in as an associate justice of the Massachusetts Appeals Court at the John Adams Courthouse in Boston. Governor Maura Healey administered the oath during an event that included remarks from Chief Justice Amy L. Blake, Chief Justice Brian J. Dunn of the Probate and Family Court, Judge Melanie J. Gargas, and Lieutenant Governor Kimberly Driscoll.

The event highlighted Allen's record on the bench and in private practice. Chief Justice Amy L. Blake said Allen "has truly hit the ground running," noting that her appellate cases were already being circulated. Chief Justice Brian J. Dunn told attendees that during Allen's six years on the Probate and Family Court she emerged as "a leader and a trusted colleague," helped pilot the pathways ADR program in Middlesex County and led efforts to protect respondents in mental-health guardianship and conservatorship cases. Judge Melanie J. Gargas described Allen as "humble" and praised her mentorship, courtroom management and public-service record.

Governor Maura Healey thanked court leaders and staff and said the administration is "grateful" for Allen's willingness to serve. Healey summarized Allen's background: born in Manchester, England, a graduate of Brandeis University and Boston College Law School, roughly 25 years in private practice focused on family law, and appointment to the Probate and Family Court in 2019. Lieutenant Governor Kimberly Driscoll noted that the administration and the Governor's Council have sought to appoint a diverse and experienced judiciary, saying nearly 100 judges had been appointed in the administration's first two years.

At the oath, Justice Allen repeated the words administered by the governor, swearing to "bear true faith and allegiance to the Commonwealth of Massachusetts" and to support the constitutions and laws of the commonwealth and the United States. After the oath, Allen thanked the governor and lieutenant governor, the Governor's Council, the judicial nominating commission, and the governor's legal office. She acknowledged court staff and colleagues by name, including operations manager Monique Duarte, her secretary Susan Henderson, law clerk Eliza Hatch, and her judicial mentor, Justice Massing. She also thanked her husband, Bob Danishevsky, and her sons, Jack and Spencer.

Allen told the Probate and Family Court colleagues in attendance that she would not forget "what you do every day for the citizens of the Commonwealth" and pledged to honor trial-court work in her role on the appeals court. The ceremony concluded with an invitation to a reception upstairs.

No votes or legislative actions were taken during the ceremony; the event was a ceremonial swearing-in following earlier nomination and confirmation processes.