Ninth Circuit
M. Margaret McKeown
Judge, U.S. Court of Appeals for the Ninth Circuit
Appointment
- Court
- U.S. Court of Appeals for the Ninth Circuit
- Title
- Judge
- Appointed by
- William J. ClintonDemocratic
- Seat
- CA91802
- Nominated
- Jan. 7, 1997
- Committee hearing
- Feb. 4, 1998
- Committee action
- Reported (favorably)Feb. 26, 1998
- Senate vote
- 80–11Roll Call
- Confirmed
- March 27, 1998
- Commissioned
- April 8, 1998
- ABA rating
- Well Qualified
- Senior status
- Sept. 15, 2022
Source Federal Judicial Center.
Recent judicial activity
Opinions authored and panels sat on, most recent first.
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Sept. 28
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Sept. 23panel identified Sat on the panel in Codoni v. Port of Seattle
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Sept. 23opinion issued Authored the opinion in Collard v. Bisignano
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Sept. 16opinion issued Authored the opinion in Blue Lake Rancheria v. Kalshi, Inc.
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Sept. 14panel identified Sat on the panel in United States v. Troiano
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Sept. 8opinion issued Authored the opinion in Jose Perez-Castillo v. Todd Blanche
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Sept. 3opinion issued Concurred in Courthouse News Service v. Omundson
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Sept. 3opinion issued Authored the opinion in Courthouse News Service v. Omundson
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Aug. 31
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Aug. 26opinion issued Authored the opinion in Grenning v. Key
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Aug. 25opinion issued Authored the opinion in County of King v. Turner
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July 30panel identified Sat on the panel in Rodriguez Vazquez v. Bostock
Cases
Appellate cases on which this judge sat, drawn from panel information published with each decision.
| Case | No. | Status | Date | |
|---|---|---|---|---|
| State of Washington v. Crown Resources Corporation | 25-2397 | Decided | Sept. 28, 2026 | |
| Collard v. Bisignano | 25-6334 | Decided | Sept. 23, 2026 | Authored |
| Codoni v. Port of Seattle | 25-2830 | Decided | Sept. 23, 2026 | |
| Blue Lake Rancheria v. Kalshi, Inc. | 25-7504 | Decided | Sept. 16, 2026 | Authored |
| United States v. Troiano | 24-6621 | Decided | Sept. 14, 2026 | |
| Jose Perez-Castillo v. Todd Blanche | 21-70087 | Decided | Sept. 8, 2026 | Authored |
| Courthouse News Service v. Omundson | 24-6697 | Decided | Sept. 3, 2026 | Authored |
| Sauk-Suiattle Indian Tribe v. State of Washington | 25-1391 | Decided | Aug. 31, 2026 | |
| Grenning v. Key | 23-3018 | Decided | Aug. 26, 2026 | Authored |
| County of King v. Turner | 25-3664 | Decided | Aug. 25, 2026 | Authored |
| Rodriguez Vazquez v. Bostock | 25-6842 | Decided | July 30, 2026 | |
| Garcia Demetrio v. Blanche | 25-991 | Decided | July 20, 2026 | Authored |
| United States v. Henrikson | 23-2132 | Decided | July 15, 2026 | |
| United States v. Deborba | 24-3304 | Decided | June 3, 2026 | Authored |
| Fuhr v. City of Seattle | 24-5618 | Decided | May 7, 2026 | Authored |
| Williams v. Legacy Health | 24-5977 | Decided | May 6, 2026 | Authored |
| 3pak LLC v. City of Seattle | 24-7139 | Decided | May 5, 2026 | Authored |
| Public Interest Legal Foundation, Inc. v. Nago | 24-6629 | Decided | April 28, 2026 | |
| McAuliffe v. Robinson Helicopter Company | 24-6086 | Decided | April 21, 2026 | Authored |
| United States v. Williams | 24-5792 | Decided | April 13, 2026 | Authored |
Judicial writings
Opinions, concurrences and dissents attributed to this judge by the source record.
| Type | Case | Court | Filed |
|---|---|---|---|
| Opinion | Collard v. Bisignano | Ninth Circuit | Sept. 23, 2026 |
| Opinion | Blue Lake Rancheria v. Kalshi, Inc. | Ninth Circuit | Sept. 16, 2026 |
| Opinion | Jose Perez-Castillo v. Todd Blanche | Ninth Circuit | Sept. 8, 2026 |
| Opinion of the Court | Courthouse News Service v. Omundson | Ninth Circuit | Sept. 3, 2026 |
| Concurrence | Courthouse News Service v. Omundson | Ninth Circuit | Sept. 3, 2026 |
| Opinion of the Court | Grenning v. Key | Ninth Circuit | Aug. 26, 2026 |
| Opinion of the Court | County of King v. Turner | Ninth Circuit | Aug. 25, 2026 |
| Opinion | Garcia Demetrio v. Blanche | Ninth Circuit | July 20, 2026 |
| Opinion | United States v. Deborba | Ninth Circuit | June 3, 2026 |
| Opinion | Fuhr v. City of Seattle | Ninth Circuit | May 7, 2026 |
| Opinion | Williams v. Legacy Health | Ninth Circuit | May 6, 2026 |
| Opinion | 3pak LLC v. City of Seattle | Ninth Circuit | May 5, 2026 |
| Opinion of the Court | McAuliffe v. Robinson Helicopter Company | Ninth Circuit | April 21, 2026 |
| Opinion | United States v. Williams | Ninth Circuit | April 13, 2026 |
| Dissent | United States v. Myers | Ninth Circuit | March 27, 2026 |
| Opinion | State of Alaska v. National Marine Fisheries Service | Ninth Circuit | March 25, 2026 |
| Opinion of the Court | Olympus Spa v. Armstrong | Ninth Circuit | March 12, 2026 |
| Opinion | United States v. Brandenburg | Ninth Circuit | Feb. 17, 2026 |
| Opinion | United States v. Sullivan | Ninth Circuit | Nov. 12, 2025 |
| Opinion | United States v. Vandyke | Ninth Circuit | Oct. 27, 2025 |