The Honorable Leonard E. Marquez

Contra Costa County Superior Court, Department 34


The Hon. Leonard E. Marquez is a judge for the Contra Costa County Superior Court in California. He was appointed to the bench by former Governor Jerry Brown in 2018. He filled the vacancy created by the retirement of the Hon. George V. Spanos (Ret.).

He is registered without party preference.

Judge Marquez graduated with his A.B. in politics from Princeton University. While at Princeton, Marquez was a member of the cheerleading squad for four years. He went on to earn his J.D. from the University of California, Los Angeles School of Law.

Prior to his appointment to the Superior Court, Marquez spent his entire legal career in private practice. He first worked as an associate at Wendel, Rosen, Black, and Dean LLP in 1999. During his nineteen years with the firm, Marquez would be named a partner in 2010 and would specialize in civil litigation including commercial landlord-tenant law, contract and lease disputes, and tort claims.

While on the bench, Judge Marquez has presided in the Criminal Division.

Some of his memberships have included the Contra Costa County Bar Association, the Hispanic Chamber of Commerce of Contra Costa County, the Festival of Latin Culture Committee, the California Hispanic Chambers of Commerce, the Donald P. McCullum Youth Court, and the East Bay La Raza Lawyers Association.

He has written several articles on subjects ranging from laws concerning evictions to intellectual property law.

Judge Marquez was born and raised in Pittsburg, California. In his free time, he is a Lego enthusiast. He not only enjoys building with Lego bricks, but he has also participated in local Lego conventions where he won a trophy for one of his entries.

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