Judge Leonard E. Marquez: Professional Background and Legal Expertise

Contra Costa County Superior Court, Department - 34, Courtroom 205

CA Bar #: 206885 (June 2000)

Appointed By: Gov. Edmund G. Brown, Jr.

Biography

Overview

The Hon. Leonard E. Marquez is a judge for the Contra Costa County Superior Court in California. Marquez was appointed to the bench by former Governor Jerry Brown on February 27, 2018, filling the vacancy created by the retirement of the Hon. George V. Spanos[1].

While on the bench, Marquez's assignments have included a general criminal assignment in the Pittsburg branch, service at the Richmond branch courthouse, and family law matters at the Spinetta Family Law Center in Martinez since January 2022[2]. In his initial criminal assignment, he presided over misdemeanor jury trials and felony preliminary hearings[2].

Educational background

Marquez earned an A.B. in politics from Princeton University. While at Princeton, he was a member of the cheerleading squad. At the University of California, Los Angeles School of Law, he completed a J.D. in 1999. He was admitted to the State Bar of California (June 2000).

Career history

After graduating from law school, Marquez began his legal career at Wendel, Rosen, Black & Dean LLP (1999 to 2009), in Oakland, as an associate. His practice focused on civil litigation, including commercial landlord-tenant law, contract and lease disputes, tort claims, and other business-related matters. In 2010, Marquez became a partner at the same firm and continued in that role until leaving private practice. He also authored articles on subjects ranging from eviction law to intellectual property.

In 2013, the San Francisco Business Times named Marquez to its Forty Under 40 list[3]. Within the Contra Costa County Bar Association, Marquez served on the Litigation Section Board, later chaired the section, sat on the editorial board of Contra Costa Lawyer Magazine, and taught in the Civil Litigation Pro Per Clinic[2]. From 2020 to 2022, he chaired the California Judges Association's Judicial Outreach Committee[2]. Service with the East Bay La Raza Lawyers Association included board membership and a term as past president[2].

Personal life

Marquez was born and raised in Pittsburg, California. In high school, he had planned to study engineering and was on track to enter Princeton's engineering program before participation in a Mock Trial program led him to pursue law[4].

Outside professional practice, his community involvement has included the Donald P. McCullum Youth Court, the Hispanic Chamber of Commerce of Contra Costa County, the Festival of Latin Culture Committee, and the California Hispanic Chambers of Commerce. He served on the board of directors of the Hispanic Chamber of Commerce of Contra Costa County and acted as general counsel to the California Hispanic Chambers of Commerce[2].

In his free time, Marquez has pursued Lego building as a hobby and has participated in local Lego conventions.

References

[1] Governor of California Press Release (February 27, 2018)
[2] Contra Costa County Bar Association — Honorable Leonard Marquez, Dept. 34
[3] Patch — Leonard Marquez Selected for the San Francisco Business Times Forty Under 40
[4] Alameda County Bar Association — Interview With Judge Leonard Marquez

Recent Cases by Hon. Leonard E. Marquez

TELVIN NDERITU vs. JERRY WILLIAM BRITTON

On October 19, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 19, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Torts

Matter Type

Automobile

Case Last Refreshed

Oct 23, 2026

Manuel Saucedo vs. Jefferey Wright

On October 16, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 16, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Torts

Matter Type

Automobile

Case Last Refreshed

Oct 23, 2026

RON NARO vs. COUNTY OF CONTRA COSTA

On October 16, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 16, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Torts

Matter Type

General Torts

Case Last Refreshed

Oct 23, 2026

Joseph Gonzalez vs. Marriot International

On October 16, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

11 Files

Filed

Oct 16, 2026

Status

Transfer

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Torts

Matter Type

General Torts

Case Last Refreshed

Oct 23, 2026

Danielle Keller vs. DOES 1 through 50 inclusive

On October 16, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 16, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Torts

Matter Type

General Torts

Case Last Refreshed

Oct 23, 2026

YORLENI LEIVA TORRES vs. DAVID RICO

On October 16, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

3 Files

Filed

Oct 16, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Torts

Matter Type

Automobile

Case Last Refreshed

Oct 22, 2026

BUSINESS GPS, LLC vs. BOXED OUT LLC,

On October 15, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 15, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Creditor

Matter Type

Collections

Case Last Refreshed

Oct 22, 2026

Rogeliza Aterrado vs. City of Pinole,

On October 15, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 15, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Torts

Matter Type

General Torts

Case Last Refreshed

Oct 22, 2026

ITRIA VENTURES LLC vs. AJAIB SINGH

On October 15, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

3 Files

Filed

Oct 15, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Commercial

Matter Type

Breach of Contract

Case Last Refreshed

Oct 22, 2026

Karen Duggan vs. Earnest Thomas

On October 15, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 15, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Torts

Matter Type

General Torts

Case Last Refreshed

Oct 22, 2026

RYAN GEISER vs. NADER EGHESAD

On October 14, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

5 Files

Filed

Oct 14, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Commercial

Matter Type

Breach of Contract

Case Last Refreshed

Oct 14, 2026

PATRICIA HARRIS vs. SAN FRANCISCO BAY AREA RAPID TRANSIT DISTRICT

On October 14, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

5 Files

Filed

Oct 14, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Torts

Matter Type

General Torts

Case Last Refreshed

Oct 22, 2026

Devontae Briscoe vs. MAJCO LLC

On October 14, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 14, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Labor and Employment

Matter Type

Wrongful Termination

Case Last Refreshed

Oct 22, 2026

Tina Kralik vs. Ford Motor Company

On October 14, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 14, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Consumer

Matter Type

Deceptive Trade Practices

Case Last Refreshed

Oct 22, 2026

Meryl Pomponio vs. Gorman Moy

On October 13, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 13, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Civil

Matter Type

Civil Rights

Case Last Refreshed

Oct 22, 2026

Omar Ramirez vs. Luis Gonzalez

On October 13, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 13, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Torts

Matter Type

Automobile

Case Last Refreshed

Oct 21, 2026

Adolfo Garcia vs. Sydney Stone

On October 13, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 13, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Torts

Matter Type

Automobile

Case Last Refreshed

Oct 21, 2026

Meryl Pomponio vs. Campestre Corporation

On October 13, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 13, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Civil

Matter Type

Civil Rights

Case Last Refreshed

Oct 22, 2026

MARCIN SKUBALA vs. FCA US LLC

On October 13, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 13, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Consumer

Matter Type

Deceptive Trade Practices

Case Last Refreshed

Oct 22, 2026

KURT BRELLIN vs. FCA US LLC, a Delaware limited liability company

On October 12, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 12, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Commercial

Matter Type

Breach of Contract

Case Last Refreshed

Oct 20, 2026

YASMIN BARRAZA, an individual vs. MARK SCOTT CONSTRUCTION, INC., a business entity of unknown form

On October 12, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 12, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Torts

Matter Type

General Torts

Case Last Refreshed

Oct 20, 2026

Kayla Ulloa vs. Connor Griffin

On October 12, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

3 Files

Filed

Oct 12, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Torts

Matter Type

Automobile

Case Last Refreshed

Oct 20, 2026

MEGAN DEMELLO vs. KW KIRKER CREEK

On October 12, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

4 Files

Filed

Oct 12, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Property

Matter Type

Unlawful Detainer

Case Last Refreshed

Oct 12, 2026

EDMON GRANT vs. HYUNDAI MOTOR AMERICA

On October 12, 2026 a case was filed in the jurisdiction of Contra Costa County. Judge Leonard E. Marquez presiding.

3 Files

Filed

Oct 12, 2026

Status

Active

Judge

Hon. Leonard E. Marquez 👉 Discover key insights by exploring more analytics for Leonard E. Marquez

Court

Superior

County

Contra Costa County, CA

Case #

(Subscribe to View)

Practice Area

Commercial

Matter Type

Breach of Contract

Case Last Refreshed

Oct 20, 2026

Discover if Hon. Marquez is the right judge for your case based on their ruling history.

View Analytics Dashboard

About

Leonard E. Marquez
Current Appointment Contra Costa County Superior Court, Department - 34, Courtroom 205	Contra Costa County Superior Court, Department - 34, Courtroom 205
Education A.B., Princeton University J.D., University of California, Los Angeles School of Law - 1999	A.B., Princeton University J.D., University of California, Los Angeles School of Law - 1999
Official Website www.cc-courts.org	www.cc-courts.org

Documents related to Leonard E. Marquez

Court Info

Court Info
Current Court:	CA - Contra Costa County Superior Court
Clerk phone:	+1 (510) 942-2134

Career History

Career History
Role	Employer	Where
Associate	Wendel, Rosen, Black & Dean LLP	Alameda County, California
Partner	Wendel, Rosen, Black & Dean LLP	Alameda County, California
Judge	Contra Costa County Superior Court	Contra Costa County, California