Magnus Karlberg
On the New York attorney register since 2007 · office in San Francisco, CA
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 4528196
- Admitted
- 2007 · Third Department
- Status
- Currently registered
- Next registration
- Jun 2027
Magnus Karlberg is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 2007 in the Third Department, with an office in San Francisco, CA; next registration due Jun 2027. The status is the same in all 3 files we hold.
What this status means on the register
On the register, “Currently registered” means Magnus Karlberg has filed the biennial registration the court system requires; the next one is due in Jun 2027.
- Currently registered unchanged
- Currently registered unchanged
- Currently registered the first file we hold
Source: NY Office of Court Administration, attorney registration file (data.ny.gov, dataset eqw2-r5nb), downloaded Sep 29, 2026; the Jul 3, 2026 and Aug 6, 2026 files for the history.
Others who list this employer on the register
491 other attorneys list Mayer Brown LLP or one of its other names as their employer on the register; 153 of them were admitted before 2007. The 5 whose admission is closest to 2007, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| Sheena Bhudia | 2007 | Currently registered |
| Cheryl Kawezya Burris | 2007 | Currently registered |
| Joseph Albert Castelluccio | 2007 | Currently registered |
| Brian Hirshberg | 2007 | Currently registered |
| Christopher James Houpt | 2007 | Currently registered |
Source: NY Office of Court Administration, attorney registration file (data.ny.gov, dataset eqw2-r5nb), downloaded Sep 29, 2026; employer spellings merged (methodology).
Where this record sits on the register
Magnus Karlberg studied at Harvard Law School (the register spells it “HARVARD”). 3,057 of its 14,378 living graduates on the register were admitted in the 2000s, as Magnus Karlberg was.
- Same law school
- 14,378living graduates; 86.1% registered (current or due), against 87.1% overall
- Office in San Francisco, CA
- 2,474living registrants (outside New York State)
Of the 2,474 living registrants with an office in San Francisco, CA, 937 were admitted before 2007 and 1,460 after.
Source: NY Office of Court Administration, attorney registration file (data.ny.gov, dataset eqw2-r5nb), downloaded Sep 29, 2026; living registrants only.
Questions this record leads to
- Everyone who lists Mayer Brown LLP492 on the register, 153 of the others admitted before 2007.
- Harvard Law School graduates on the register14,378 living, 86.1% registered.
- New York-admitted attorneys in San Francisco, CA2,474 living registrants give an office there.
- Admitted in 20078,913 people admitted in 2007 are on the register, 2,894 of them through the Third Department.
- Every registration that reads “Currently registered”286,911 on the register file of Sep 29, 2026, by decade of admission.
- What a New York lawyer may chargeThe court rules on fees, retainers and fee disputes, each cited.
How to confirm it officially
For a statement of Magnus Karlberg’s standing, contact the Attorney Registration Unit of the NY Office of Court Administration (nycourts.gov/attorneys), or ask the Appellate Division, Third Department, which admitted Magnus Karlberg in 2007. The register places the office outside New York, so a complaint would go to that department’s grievance committee (22 NYCRR 1240.7(a)(2)).
This page reads the register file of Sep 29, 2026, and the court system’s own search can be newer; the register shows only the current value, so a suspension that ended before the files we hold, or a censure, leaves no trace here (Appellate Division decisions are published through the court system’s Law Reporting Bureau).