Katherine Lily Mesner-Hage
On the New York attorney register since 2014 · office in Bridgeport, CT
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 5274899
- Admitted
- 2014 · Third Department
- Status
- Due to re‑register
- Next registration
- Sep 2026
Katherine Lily Mesner-Hage is due to re‑register on the New York attorney register file of Sep 29, 2026. Admitted in 2014 in the Third Department, with an office in Bridgeport, CT; next registration due Sep 2026. Since Jul 3, 2026 it has moved only through the routine two-year cycle.
What this status means on the register
On the register, “Due to re‑register” means the attorney has a biennial registration falling due or overdue: the rule asks for it within 30 days after the attorney’s birthday in each alternate year, and the record gives the month it is due. The value stays until the register records the filing or marks the registration delinquent, so the month can have passed; by itself it is not a finding.
- Due to re‑register unchanged
- Currently registered to Due to re‑register the routine two-year cycle: the registration window opened
- 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
The register gives this attorney’s employer as “Koskoff Koskoff & Bieder PC”. We count that spelling with Koskoff Koskoff & Bieder, P.C., the name most registrants give for the firm now; the register does not say where the attorney works today.
6 other attorneys list Koskoff Koskoff & Bieder, P.C. or one of its other names as their employer on the register; 3 of them were admitted before 2014, and 6 of the 7 give an office in Bridgeport, CT. The 5 whose admission is closest to 2014, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| Kelly Ann Fitzpatrick | 2010 | Currently registered |
| Margaret Maigret Donovan | 2012 | Currently registered |
| Matthew Samuel Blumenthal | 2016 | Currently registered |
| Ryan Darrell Daugherty | 2018 | Currently registered |
| Renee Marie Mihail | 2024 | 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
Katherine Lily Mesner-Hage studied at Yale Law School (the register spells it “YALE LAW”). 1,147 of its 5,039 living graduates on the register were admitted in the 2010s, as Katherine Lily Mesner-Hage was.
- Same law school
- 5,039living graduates; 85.8% registered (current or due), against 87.1% overall
- Office in Bridgeport, CT
- 129living registrants (outside New York State)
Of the 129 living registrants with an office in Bridgeport, CT, 98 were admitted before 2014 and 28 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
- Yale Law School graduates on the register5,039 living, 85.8% registered.
- New York-admitted attorneys in Bridgeport, CT129 living registrants give an office there.
- Admitted in 201410,747 people admitted in 2014 are on the register, 4,172 of them through the Third Department.
- Every registration that reads “Due to re‑register”47,986 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 Katherine Lily Mesner-Hage’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 Katherine Lily Mesner-Hage in 2014. 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).