Judge Leonard D. Steinman: Professional Background and Legal Expertise

Nassau County Supreme Court, Department Part 15

Biography

The Hon. Leonard D. Steinman is a justice on the Nassau County Supreme Court in the 10th Judicial District of New York. He was elected to the bench on November 6, 2012.


Prior to his election, Steinman was a partner at Blank Rome LLP, a legal practice he joined in 1991. Before that, he spent time as an associate at Summit, Rovins & Feldesman (1988 to 1991).


Steinman earned a B.A. from Boston University in 1981. He then completed a J.D. at Albany Law School in 1984. He was licensed to practice in New York (1985).


After graduating from law school, Steinman began his legal career as an associate at Montclare & Guay. He worked in that capacity until 1985, at which time he joined Rubin, Baum, Levin, Constant & Friedman.


His memberships have included the Theodore Roosevelt American Inn of Court. He has also been involved with the Nassau County Industrial Development Authority (2010) and the Nassau County Interim Finance Authority (2010 to 2012).


Born and raised in Glen Clove, New York, Steinman held his bar mitzvah at Congregation Tifereth Israel, the oldest continuously operating synagogue on Long Island.


He is registered as a Democrat.

Recent Cases by Hon. Leonard D. Steinman

On November 6, 2026 a comm-contract case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

Filed

Nov 06, 2026

Status

Active

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

Comm-Contract

Practice Area

Commercial

Matter Type

Breach of Contract

Case Last Refreshed

Nov 06, 2026

On November 6, 2026 a sp-cplr article 75 (arbitration) case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

Filed

Nov 06, 2026

Status

Active

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

SP-CPLR Article 75 (Arbitration)

Practice Area

Arbitration

Matter Type

General Arbitration

Case Last Refreshed

Nov 06, 2026

On November 5, 2026 an om-other case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

Filed

Nov 05, 2026

Status

Judgment (Other)

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

OM-Other

Case Last Refreshed

Nov 05, 2026

On October 28, 2026 a sp-cplr article 78 (body or officer) case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

Filed

Oct 28, 2026

Status

Closed

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

SP-CPLR Article 78 (Body or Officer)

Practice Area

Administrative

Matter Type

Agency Action

Case Last Refreshed

Oct 30, 2026

On October 23, 2026 a sp-other case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

18 Files
Filed

Oct 23, 2026

Status

Active

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

SP-Other

Case Last Refreshed

Oct 28, 2026

On October 22, 2026 a real property - other (rpapl 881 proceeding) case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

7 Files
Filed

Oct 22, 2026

Status

Active

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

Real Property - Other (RPAPL 881 Proceeding)

Practice Area

Property

Matter Type

General Property

Case Last Refreshed

Oct 26, 2026

On October 20, 2026 a special proceedings - cplr article 75 case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

9 Files
Filed

Oct 20, 2026

Status

Judgment on Award

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

Special Proceedings - CPLR Article 75

Practice Area

Arbitration

Matter Type

General Arbitration

Case Last Refreshed

Oct 21, 2026

On October 19, 2026 a special proceedings - cplr article 75 case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

10 Files
Filed

Oct 19, 2026

Status

Judgment on Award

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

Special Proceedings - CPLR Article 75

Practice Area

Arbitration

Matter Type

General Arbitration

Case Last Refreshed

Oct 20, 2026

On October 19, 2026 a tort-motor vehicle case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

12 Files
Filed

Oct 19, 2026

Status

Active

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

Tort-Motor Vehicle

Practice Area

Torts

Matter Type

Automobile

Case Last Refreshed

Nov 05, 2026

On October 19, 2026 a tort-motor vehicle case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

12 Files
Filed

Oct 19, 2026

Status

Active

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

Tort-Motor Vehicle

Practice Area

Torts

Matter Type

Automobile

Case Last Refreshed

Nov 05, 2026

On October 16, 2026 an om-other case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

Filed

Oct 16, 2026

Status

Closed

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

OM-Other

Case Last Refreshed

Nov 06, 2026

On October 15, 2026 a special proceedings - cplr article 75 case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

11 Files
Filed

Oct 15, 2026

Status

Active

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

Special Proceedings - CPLR Article 75

Practice Area

Arbitration

Matter Type

General Arbitration

Case Last Refreshed

Oct 15, 2026

On October 14, 2026 a special proceedings - cplr article 75 case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

8 Files
Filed

Oct 14, 2026

Status

Judgment on Award

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

Special Proceedings - CPLR Article 75

Practice Area

Arbitration

Matter Type

General Arbitration

Case Last Refreshed

Oct 15, 2026

On October 12, 2026 an om-other case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

50 Files
Filed

Oct 12, 2026

Status

Settlement

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

OM-Other

Practice Area

Commercial

Matter Type

Contractual Fraud

Case Last Refreshed

Oct 22, 2026

On October 5, 2026 a special proceedings - cplr article 75 case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

6 Files
Filed

Oct 05, 2026

Status

Judgment on Award

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

Special Proceedings - CPLR Article 75

Practice Area

Arbitration

Matter Type

General Arbitration

Case Last Refreshed

Oct 06, 2026

On October 5, 2026 a special proceedings - cplr article 75 case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

6 Files
Filed

Oct 05, 2026

Status

Judgment on Award

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

Special Proceedings - CPLR Article 75

Practice Area

Arbitration

Matter Type

General Arbitration

Case Last Refreshed

Oct 06, 2026

On October 5, 2026 a special proceedings - cplr article 75 case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

6 Files
Filed

Oct 05, 2026

Status

Judgment on Award

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

Special Proceedings - CPLR Article 75

Practice Area

Arbitration

Matter Type

General Arbitration

Case Last Refreshed

Oct 06, 2026

On October 2, 2026 a sp-cplr article 75 (arbitration) case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

9 Files
Filed

Oct 02, 2026

Status

Judgment on Award

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

SP-CPLR Article 75 (Arbitration)

Practice Area

Arbitration

Matter Type

General Arbitration

Case Last Refreshed

Oct 05, 2026

On September 30, 2026 a comm-other case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

10 Files
Filed

Sep 30, 2026

Status

Active

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

Comm-Other

Practice Area

Commercial

Matter Type

General Commercial

Case Last Refreshed

Oct 02, 2026

On September 29, 2026 an om-mechanic's lien case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

6 Files
Filed

Sep 29, 2026

Status

Active

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

OM-Mechanic's Lien

Practice Area

Creditor

Matter Type

Liens

Case Last Refreshed

Oct 21, 2026

On September 25, 2026 a sp-cplr article 75 (arbitration) case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

9 Files
Filed

Sep 25, 2026

Status

Judgment on Award

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

SP-CPLR Article 75 (Arbitration)

Practice Area

Arbitration

Matter Type

General Arbitration

Case Last Refreshed

Nov 06, 2026

On September 23, 2026 a comm-contract case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

4 Files
Filed

Sep 23, 2026

Status

Active

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

Comm-Contract

Practice Area

Commercial

Matter Type

Breach of Contract

Case Last Refreshed

Nov 05, 2026

On September 22, 2026 a sp-cplr article 75 (arbitration) case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

8 Files
Filed

Sep 22, 2026

Status

Active

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

SP-CPLR Article 75 (Arbitration)

Practice Area

Arbitration

Matter Type

General Arbitration

Case Last Refreshed

Oct 23, 2026

On September 18, 2026 a comm-contract case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

8 Files
Filed

Sep 18, 2026

Status

Active

Judge

Hon. Leonard D. Steinman Trellis Spinner 👉 Discover key insights by exploring more analytics for Leonard D. Steinman

Court

Supreme

County

Nassau County, NY

Court Category

Comm-Contract

Practice Area

Commercial

Matter Type

Breach of Contract

Case Last Refreshed

Oct 29, 2026