Attorney RecordMarin County
Marguerite Mary Leoni · California Lawyer
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Marguerite Mary Leoni is on California’s State Bar roll, #101696, admitted in 1981; license status: active as of 22 July 2026. The address of record is in San Rafael, Marin County. Practice areas listed in the registry: Election and Campaign Law. 14 case appearances are listed on this profile. The employer on the official record is Nielsen Merksamer et al. Registry record updated 19 August 2026; license information comes from the State Bar.
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The record
| State Bar number | #101696 |
|---|---|
| License status | Active |
| Admitted | 1981 |
| Law school | UC Hastings COL |
| Firm | Nielsen Merksamer et al |
| Location | San Rafael, Marin County |
| Registry identity | Official State Bar record |
Practice areas
Practice areas are self-reported to the State Bar or added by the attorney; listing one is not a State Bar certification.
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Cases of record
From published opinions naming this attorney as counsel. The attorney has not yet confirmed these records.
| Case | Appeared for | Citation | Court | Decided |
|---|---|---|---|---|
| Luna v. Cnty. of Kern | Counsel for the defendant | 291 F. Supp. 3d 1088 | U.S. District Court, Eastern District of California | 23 February 2018 |
| Rubin v. Padilla | Counsel for the respondent | 233 Cal. App. 4th 1128 | California Court of Appeal | 29 January 2015 |
| Jauregui v. City of Palmdale | Counsel for the appellant | 226 Cal. App. 4th 781 | California Court of Appeal | 28 May 2014 |
| Michael Chamness v. Abel Maldonado | Counsel for the respondent | 722 F.3d 1110 | U.S. Court of Appeals for the Ninth Circuit | 3 July 2013 |
| Field v. Bowen | Counsel for the respondent | 199 Cal. App. 4th 346 | California Court of Appeal | 19 September 2011 |
| Lopez v. Merced County, Cal. | Counsel for the defendant | 473 F. Supp. 2d 1072 | U.S. District Court, Eastern District of California | 26 January 2007 |
| San Rafael Elementary School District v. State Board of Education | Counsel for the appellant | 73 Cal. App. 4th 1018 | California Court of Appeal | 28 July 1999 |
| Mapstead v. Anchundo | Counsel for the appellant | 63 Cal. App. 4th 246 | California Court of Appeal | 17 April 1998 |
| Mandicino v. Maggard | Counsel for the appellant | 210 Cal. App. 3d 1413 | California Court of Appeal | 30 May 1989 |
| Lungren v. Deukmejian | Counsel for the petitioner | 45 Cal. 3d 727 | California Supreme Court | 23 June 1988 |
| Kuhs v. Superior Court | Counsel for the petitioner | 201 Cal. App. 3d 966 | California Court of Appeal | 1 June 1988 |
| Badham v. March Fong Eu | Counsel for the plaintiff | 694 F. Supp. 664 | U.S. District Court, Northern District of California | 21 April 1988 |
| Citizens Against Rent Control v. City of Berkeley | Counsel for the respondent | 181 Cal. App. 3d 213 | California Court of Appeal | 21 May 1986 |
| Badham v. March Fong Eu | Counsel for the plaintiff | 568 F. Supp. 156 | U.S. District Court, Northern District of California | 20 June 1983 |
Appearances in published opinions, drawn from public court records. Cases of record are matters of public record and are not a representation of results; past results do not guarantee a similar outcome. Legal information, not legal advice.
Each case name opens the published opinion it comes from. Is a case not this attorney’s? The attorney can claim this profile and mark it as not theirs, which removes it from this page; anyone can report an error through Help & Support.
On the official record
The employer on the official record is Nielsen Merksamer et al.
The law school on the record is UC Hastings College of the Law.
Admitted to the California Bar in 1981 · 45 years on the roll.
Practice areas on the record: Election and Campaign Law.
14 appearances as counsel in published opinions are on this record.
The address of record is in San Rafael, in Marin County, where matters are ordinarily heard at the Superior Court of California, County of Marin, seated at San Rafael.
Confirm Marguerite Mary Leoni’s license status, bar number #101696, and official disciplinary or administrative history directly with the State Bar of California at apps.calbar.ca.gov before retaining counsel. This profile does not reproduce the complete official history; missing information does not mean no discipline. This page indexes public-record data and identifies verified claims; it does not rate attorney quality or predict results.
Legal information, not legal advice.
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