Keri Linnea Costello
On the New York attorney register since 2010 · office in New York, NY
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 4836573
- Admitted
- 2010 · Third Department
- Status
- Currently registered
- Next registration
- Jun 2028
Keri Linnea Costello is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 2010 in the Third Department, with an office in New York, NY; next registration due Jun 2028. The status is the same in all 3 files we hold.
What this status means on the register
On the register, “Currently registered” means Keri Linnea Costello has filed the biennial registration the court system requires; the next one is due in Jun 2028.
- 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
75 other attorneys list Sullivan & Worcester LLP or one of its other names as their employer on the register; 37 of them were admitted before 2010, and 52 of the 76 give an office in New York, NY. The 5 whose admission is closest to 2010, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| Ron Ben-Bassat | 2009 | Currently registered |
| Michael D Dedonato | 2010 | Currently registered |
| Jiayin Liao | 2010 | Due to re‑register |
| Spencer Andrew Stone | 2010 | Currently registered |
| Jeffrey Brian Morlend | 2011 | 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
Keri Linnea Costello studied at Western New England University School of Law. 275 of its 1,389 living graduates on the register were admitted in the 2010s, as Keri Linnea Costello was.
- Same law school
- 1,389living graduates; 88.1% registered (current or due), against 87.1% overall
- Office in New York, NY
- 93,604living registrants
Of the 93,604 living registrants with an office in New York, NY, 47,610 were admitted before 2010 and 43,603 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 Sullivan & Worcester LLP76 on the register, 37 of the others admitted before 2010; 52 of the 76 give an office in New York, NY.
- Western New England University School of Law graduates on the register1,389 living, 88.1% registered; 2 of them list Sullivan & Worcester LLP.
- Attorneys with an office in New York, NY93,604 living registrants give an office there.
- New York County’s registered bar75,989 currently registered, 46.63 per 1,000 residents.
- Admitted in 201010,128 people admitted in 2010 are on the register, 3,925 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 Keri Linnea Costello’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 Keri Linnea Costello in 2010. A complaint about this attorney would go to the First Department’s grievance committee, which covers New York County, where the register places the office.
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).