Mark Peter Kesslen
On the New York attorney register since 1990 · office in Roseland, NJ
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 2324085
- Admitted
- 1990 · First Department
- Status
- Currently registered
- Next registration
- Dec 2026
Mark Peter Kesslen is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 1990 in the First Department, with an office in Roseland, NJ; next registration due Dec 2026. The status is the same in all 3 files we hold.
What this status means on the register
On the register, “Currently registered” means Mark Peter Kesslen has filed the biennial registration the court system requires; the next one is due in Dec 2026.
- 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
285 other attorneys list Lowenstein Sandler LLP or one of its other names as their employer on the register; 18 of them were admitted before 1990, and 137 of the 286 give an office in Roseland, NJ. The 5 whose admission is closest to 1990, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| Selim B. Day | 1989 | Suspended, delinquent |
| Diane L. Moss | 1990 | Currently registered |
| Jeffrey David Prol | 1990 | Currently registered |
| Catherine Weiss | 1990 | Currently registered |
| Ivan K. Blumenthal | 1991 | 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
Mark Peter Kesslen studied at Case Western Reserve University School of Law (the register spells it “CASE WESTERN RESERVE UNIV”). 181 of its 1,256 living graduates on the register were admitted in the 1990s, as Mark Peter Kesslen was.
- Same law school
- 1,256living graduates; 86.9% registered (current or due), against 87.1% overall
- Office in Roseland, NJ
- 685living registrants (outside New York State)
Of the 685 living registrants with an office in Roseland, NJ, 101 were admitted before 1990 and 566 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 Lowenstein Sandler LLP286 on the register, 18 of the others admitted before 1990; 137 of the 286 give an office in Roseland, NJ.
- Case Western Reserve University School of Law graduates on the register1,256 living, 86.9% registered.
- New York-admitted attorneys in Roseland, NJ685 living registrants give an office there.
- Admitted in 19906,112 people admitted in 1990 are on the register, 2,199 of them through the First 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 Mark Peter Kesslen’s standing, contact the Attorney Registration Unit of the NY Office of Court Administration (nycourts.gov/attorneys), or ask the Appellate Division, First Department, which admitted Mark Peter Kesslen in 1990. 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).