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Immigration judge

O'Sullivan, Maureen

Boston Immigration Court

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These figures are not current

Captured September 18, 2026 — about 0 months ago. Decisions made since then are not included.

Boston Immigration Court

Lifetime grant rate

85.0%

2,546 decisions

Grant rate, last 12 months on record

95.8%

238 decisions · 12 months ending April 2025

50.4%

Court lifetime average

Grant-rate trend

Each point is the grant rate across the 12 months ending in that month — a rolling window, not a single month on its own. A point appears only where those 12 months hold at least 25 decisions. A rolling window covers a much shorter span than the lifetime figure above, so the two can differ materially; both are correct measures of different periods.

0%25%50%75%100%May 2022Dec 2022Jul 2023Feb 2024Sep 2024Apr 2025Month each 12-month window ends95.8%93.0% — 12 months ending May 2022 (358 decisions)93.0% — 12 months ending Jun 2022 (357 decisions)92.2% — 12 months ending Jul 2022 (361 decisions)93.5% — 12 months ending Aug 2022 (352 decisions)93.8% — 12 months ending Sep 2022 (371 decisions)92.7% — 12 months ending Oct 2022 (381 decisions)92.4% — 12 months ending Nov 2022 (380 decisions)92.3% — 12 months ending Dec 2022 (375 decisions)91.6% — 12 months ending Jan 2023 (381 decisions)91.4% — 12 months ending Feb 2023 (374 decisions)92.3% — 12 months ending Mar 2023 (351 decisions)91.8% — 12 months ending Apr 2023 (342 decisions)90.6% — 12 months ending May 2023 (329 decisions)89.8% — 12 months ending Jun 2023 (323 decisions)88.9% — 12 months ending Jul 2023 (325 decisions)87.5% — 12 months ending Aug 2023 (328 decisions)87.0% — 12 months ending Sep 2023 (299 decisions)88.7% — 12 months ending Oct 2023 (293 decisions)89.9% — 12 months ending Nov 2023 (306 decisions)91.4% — 12 months ending Dec 2023 (339 decisions)92.8% — 12 months ending Jan 2024 (346 decisions)92.8% — 12 months ending Feb 2024 (349 decisions)92.5% — 12 months ending Mar 2024 (320 decisions)93.5% — 12 months ending Apr 2024 (309 decisions)94.4% — 12 months ending May 2024 (303 decisions)95.4% — 12 months ending Jun 2024 (305 decisions)97.7% — 12 months ending Jul 2024 (299 decisions)99.3% — 12 months ending Aug 2024 (300 decisions)99.7% — 12 months ending Sep 2024 (292 decisions)99.3% — 12 months ending Oct 2024 (284 decisions)98.9% — 12 months ending Nov 2024 (271 decisions)98.7% — 12 months ending Dec 2024 (231 decisions)97.7% — 12 months ending Jan 2025 (219 decisions)97.6% — 12 months ending Feb 2025 (209 decisions)97.2% — 12 months ending Mar 2025 (217 decisions)95.8% — 12 months ending Apr 2025 (238 decisions)

7 months are not plotted: the 12 months ending there held fewer than 25 decisions.

Same judge name at other courts

This record covers one court only. The same judge name also appears at the courts below, with separate statistics.

Monthly decisions

Showing the most recent 24 months on record. Months with no decisions are not listed.

Decisions and grant rate by month for this judge
MonthDecisionsGrant rate
April 20252684.6%
March 20252996.6%
February 202514Not reported
January 202524Not reported
December 202423Not reported
November 202417Not reported
October 202421Not reported
September 20249Not reported
August 202423Not reported
July 202418Not reported
June 202420Not reported
May 202414Not reported
April 20245Not reported
March 202421Not reported
February 202424Not reported
January 202436100.0%
December 202363100.0%
November 202330100.0%
October 202329100.0%
September 202317Not reported
August 202322Not reported
July 202324Not reported
June 202318Not reported
May 202320Not reported

Related pages

Source and method

These figures come from case data released by the Executive Office for Immigration Review (EOIR) under the Freedom of Information Act, published by the Deportation Data Project. Imigrar did not produce or estimate them.

Captured on September 18, 2026, about 0 months ago, so it is out of date. The record covers decisions from October 1997 through July 2026; nothing filed or decided after July 2026 appears here.

Grant rates are historical aggregates. They describe decisions already made. They do not predict the outcome of any individual case, and no figure on this page should be read as a forecast of what will happen in yours.

This page is informational only and is not legal advice. Reading it does not create an attorney-client relationship. Only the official EOIR record is authoritative.

Open the source data — Deportation Data Project

Questions about your own case?

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