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 January 29, 2026 a special proceedings - other (turnover proceeding) case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

7 Files
Filed

Jan 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

Special Proceedings - Other (TURNOVER PROCEEDING)

Practice Area

Creditor

Matter Type

Judgment Enforcement

Case Last Refreshed

Jan 29, 2026

On January 27, 2026 a special proceedings - cplr article 75 case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

9 Files
Filed

Jan 27, 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

Jan 27, 2026

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

7 Files
Filed

Jan 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

Jan 27, 2026

On January 21, 2026 a special proceedings - cplr article 75 case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

9 Files
Filed

Jan 21, 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

Jan 22, 2026

On January 15, 2026 a sp-cplr article 75 (arbitration) case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

8 Files
Filed

Jan 15, 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

Jan 16, 2026

On January 13, 2026 a special proceedings - cplr article 75 case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

6 Files
Filed

Jan 13, 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

Jan 14, 2026

On January 11, 2026 a sp-cplr article 75 (arbitration) case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

8 Files
Filed

Jan 11, 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

Jan 13, 2026

On January 6, 2026 a special proceedings - cplr article 75 case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

8 Files
Filed

Jan 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

Special Proceedings - CPLR Article 75

Practice Area

Arbitration

Matter Type

General Arbitration

Case Last Refreshed

Jan 07, 2026

On January 5, 2026 a commercial - contract case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

7 Files
Filed

Jan 05, 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

Commercial - Contract

Practice Area

Commercial

Matter Type

Breach of Contract

Case Last Refreshed

Jan 06, 2026

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

4 Files
Filed

Jan 05, 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

Jan 06, 2026

On January 2, 2026 a special proceedings - cplr article 78 case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

6 Files
Filed

Jan 02, 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

Special Proceedings - CPLR Article 78

Practice Area

Administrative

Matter Type

Agency Action

Case Last Refreshed

Jan 02, 2026

On December 29, 2025 a sp-cplr article 75 (arbitration) case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

11 Files
Filed

Dec 29, 2025

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

Dec 31, 2025

On December 24, 2025 a sp-other case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

12 Files
Filed

Dec 24, 2025

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

Jan 09, 2026

On December 22, 2025 a special proceedings - cplr article 75 case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

11 Files
Filed

Dec 22, 2025

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

Dec 23, 2025

On December 18, 2025 an om-other case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

6 Files
Filed

Dec 18, 2025

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

Jan 08, 2026

On December 18, 2025 a tort-other case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

Filed

Dec 18, 2025

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-Other

Practice Area

Torts

Matter Type

General Torts

Case Last Refreshed

Jan 09, 2026

On December 17, 2025 a tort-other case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

17 Files
Filed

Dec 17, 2025

Status

Stayed

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-Other

Practice Area

Torts

Matter Type

General Torts

Case Last Refreshed

Jan 21, 2026

On December 16, 2025 a comm-contract case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

5 Files
Filed

Dec 16, 2025

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

Dec 18, 2025

On December 16, 2025 a sp-other case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

7 Files
Filed

Dec 16, 2025

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

Jan 12, 2026

On December 16, 2025 a sp-cplr article 75 (arbitration) case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

7 Files
Filed

Dec 16, 2025

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 75 (Arbitration)

Practice Area

Arbitration

Matter Type

General Arbitration

Case Last Refreshed

Jan 07, 2026

On December 12, 2025 a rp-other case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

10 Files
Filed

Dec 12, 2025

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

RP-Other

Practice Area

Property

Matter Type

General Property

Case Last Refreshed

Dec 17, 2025

On December 11, 2025 a sp-other case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

5 Files
Filed

Dec 11, 2025

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-Other

Practice Area

Commercial

Matter Type

Breach of Rental

Case Last Refreshed

Jan 09, 2026

On December 10, 2025 a comm-contract case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

5 Files
Filed

Dec 10, 2025

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

Jan 22, 2026

On December 10, 2025 a sp-cplr article 75 (arbitration) case was filed in the jurisdiction of Nassau County. Judge Leonard D. Steinman presiding.

9 Files
Filed

Dec 10, 2025

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

Jan 27, 2026