Mark Gerald Mastroianni
How Judge Mastroianni rules, drawn from 35 signed orders. Every observation links to the order it came from.
About Judge Mastroianni
Mark Gerald Mastroianni is a judge of the United States District Court for the District of Massachusetts. Appointed by President Barack Obama, Judge Mastroianni received a commission on June 5, 2014.
Judge Mastroianni's practices and standing orders
Rules for cases before Judge Mastroianni, as published on the court's website (checked October 9, 2026). Judges revise these often, so confirm the current version on the court's site before you file.
- Judicial Forum Survey ↗
- Standing Order - Confidentiality Agreements ↗
- Standing Order - Courtroom Opportunities for Relatively Inexperienced Attorneys ↗
- Standing Order - Motions for Default Judgement ↗
Key rules
Filing
File any confidentiality agreement covering discovery with the court.
“Parties executing confidentiality agreements that cover discovery practice shall file copies of such agreements with the court.”
Motions
Submit an appropriate proposed default-judgment form with a motion for default judgment.
“The moving party shall also submit an appropriate form of default judgment”
Trial
Move for a jury questionnaire by the motions in limine deadline.
“Attorneys wishing for the court to use a jury questionnaire should file a motion with their request no later than the deadline for filing motions in limine.”
Standing orders for every case in this court
Orders the court applies to all of its cases, whichever judge has them, as published on the court's website (checked October 9, 2026).
How Judge Mastroianni decides
Patterns drawn from this judge's own signed orders. Every observation links to the order it came from.
Procedural preferences
In LaRoe, he adopted a dismissal sanction after repeated refusal to comply with discovery orders prevented the remaining retaliation claim from reaching a merits judgment.
“While dismissal is a severe sanction, a party’s repeated refusal to cooperate in discovery creates a roadblock that prevents the court from reaching a final judgment on the merits.”
Signed rulings
A grounded sample of orders signed by this judge, with the verbatim dispositive language.
“Defendant’s motion to dismiss (Dkt. No. 15) is DENIED in its entirety.”
“Defendant’s Motion to Dismiss is hereby DENIED.”
“the court ALLOWS Defendant’s motion to dismiss this claim without prejudice”
“the court will grant Defendants’ motion in part and deny it in part.”
“the court ALLOWS Greyhound’s Motion to Dismiss (Dkt. No. 12) to the extent it seeks dismissal of the web commission claims in Counts I, II, and III which are predicated on the 2008 Agreement.”
“Defendants’ motions for dismissal (Dkt. Nos. 12, 25) are GRANTED.”
“the court DENIES Defendants’ Motion to Dismiss as to the claims against Defendants City of Springfield and Springfield Public Schools and ALLOWS the motion as to the claims against Defendants Domenic Samo and Daniel J. Warwick.”
“the court ALLOWS Defendant’s motion to dismiss.”
“the court ALLOWS Cosby’s motion for judgment on the pleadings, in part, insofar as it seeks a judgment that AIG owes Cosby a duty to defend.”
“The court also DENIES AIG’s Motion for Summary Judgment”
“the court will grant Defendants’ motion in part and deny it in part.”
“Defendant’s Motion to Dismiss is hereby DENIED.”
“Respondents’ motion to dismiss (Dkt. No. 16) is DENIED in its entirety.”
Caseload & timing
From public federal docket records for this judge.
The post-appointment sample is dominated by civil-rights and employment matters, consistent with a Western Division docket; the enumeration also includes a substantial criminal caseload not reflected in this civil duration slice.
Pending matters in the official report
Reported by the Administrative Office of the U.S. Courts under the Civil Justice Reform Act, as of March 31, 2026.
| Motions pending more than six months | 7 |
| Bench trials submitted more than six months | 0 |
| Bankruptcy appeals pending more than six months | 0 |
| Social Security appeals pending more than six months | 5 |
| Civil cases pending more than three years | 10 |
| Report | Motions over six months | Cases over three years |
|---|---|---|
| Mar 2026 | 7 | 10 |
| Sep 2025 | 9 | 7 |
| Mar 2025 | 9 | 8 |
| Sep 2024 | 7 | 11 |
| Mar 2024 | 5 | 20 |
| Sep 2023 | 5 | 26 |
| Mar 2023 | 8 | 24 |
| Sep 2022 | 18 | 20 |
| Mar 2022 | 6 | 15 |
| Sep 2021 | 6 | 12 |
| Mar 2021 | 30 | 11 |
| Sep 2020 | 37 | 9 |
A snapshot on that date: matters listed may since have been decided or reassigned. A motion referred to a magistrate judge is counted for both judges. Motions in multidistrict litigation, section 2255 cases and Social Security appeals are not counted, and a very large three-year count is generally a multidistrict docket. Source: Appendix A of the report (PDF); about the report.
How long civil cases take in this court
For the whole of U.S. District Court for the District of Massachusetts, not for Judge Mastroianni: median time from filing to disposition of the civil cases the court closed in the 12 months ending September 30, 2025, as reported by the Administrative Office of the U.S. Courts.
| Cases | Median time | |
|---|---|---|
| All civil cases closed | 2,682 | 7.3 months |
| Closed with no court action | 1,095 | 3.8 months |
| Closed before pretrial | 881 | 7.1 months |
| Closed during or after pretrial | 676 | 17.4 months |
| Closed during trial | 30 | 34.8 months |
| 12 months ending | Cases closed | Median time |
|---|---|---|
| Sep 2025 | 2,682 | 7.3 months |
| Sep 2024 | 2,439 | 7.2 months |
| Sep 2023 | 2,756 | 9.1 months |
| Sep 2022 | 2,222 | 10.2 months |
| Sep 2021 | 2,582 | 12.2 months |
| Sep 2020 | 2,391 | 11.2 months |
| Sep 2019 | 4,438 | 23 months |
The table leaves out prisoner petitions, land condemnations, deportation reviews, recovery of overpayments and enforcement of judgments, and reports no median for fewer than 10 cases. A district that closed a large multidistrict litigation in the period shows very large counts and long medians for that year. Source: Table C-5, U.S. District Courts (spreadsheet).
Draft for Judge Mastroianni with the record in hand
Ezel grounds your drafting and research in this profile: what has persuaded Judge Mastroianni, and what has not, cited to the signed orders.
Opens in Ezel Pro.
- Grounded in Judge Mastroianni's own signed orders
- Cites every source it relies on, so you can verify it
- Chat, drafting and research in one workspace