Kathryn Marie Sullivan
On the New York attorney register since 2012 · office in Valhalla, NY
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 5011218
- Admitted
- 2012 · Second Department
- Status
- Due to re‑register
- Next registration
- Oct 2026
Kathryn Marie Sullivan is due to re‑register on the New York attorney register file of Sep 29, 2026. Admitted in 2012 in the Second Department, with an office in Valhalla, NY; next registration due Oct 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.
- Currently registered to Due to re‑register the routine two-year cycle: the registration window opened
- 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
111 other attorneys list Kaufman Borgeest & Ryan LLP or one of its other names as their employer on the register; 50 of them were admitted before 2012, and 37 of the 112 give an office in Valhalla, NY. The 5 whose admission is closest to 2012, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| David Bloom | 2011 | Currently registered |
| Matthew M. Collibee | 2012 | Currently registered |
| Matthew Elliott Mawby | 2012 | Currently registered |
| John Peter Rancourt | 2012 | Delinquent |
| Henry Bundschu Tilson Jr. | 2012 | 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
Kathryn Marie Sullivan studied at Elisabeth Haub School of Law at Pace University (the register spells it “PACE UNIV. SCHOOL OF LAW”). 1,807 of its 8,033 living graduates on the register were admitted in the 2010s, as Kathryn Marie Sullivan was.
- Same law school
- 8,033living graduates; 90.0% registered (current or due), against 87.1% overall
- Office in Valhalla, NY
- 124living registrants
Of the 124 living registrants with an office in Valhalla, NY, 90 were admitted before 2012 and 30 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 Kaufman Borgeest & Ryan LLP112 on the register, 50 of the others admitted before 2012; 37 of the 112 give an office in Valhalla, NY.
- Elisabeth Haub School of Law at Pace University graduates on the register8,033 living, 90.0% registered; 12 of them list Kaufman Borgeest & Ryan LLP.
- Attorneys with an office in Valhalla, NY124 living registrants give an office there.
- Westchester County’s registered bar7,255 currently registered, 7.26 per 1,000 residents.
- Admitted in 20129,632 people admitted in 2012 are on the register, 2,535 of them through the Second 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 Kathryn Marie Sullivan’s standing, contact the Attorney Registration Unit of the NY Office of Court Administration (nycourts.gov/attorneys), or ask the Appellate Division, Second Department, which admitted Kathryn Marie Sullivan in 2012. A complaint about this attorney would go to the Second Department’s Grievance Committee for the Ninth Judicial District, which covers Westchester 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).