Atty. Sean Ryan Marciniak

Atty. Sean Ryan Marciniak

Sean Ryan Marciniak is a lawyer practicing entitlement, environmental, land use & ceqa and 5 other areas of law. Sean received a degree from Jurisprudence Awards in Contracts and Criminal Procedure, and has been licensed for 19 years.

Walnut Creek Walnut Creek 19 yrs experience 19 year
Call (925) 222-3388 Book Appointment

Profile Summary

About Sean Ryan Marciniak at a glance

Sean Ryan Marciniak is a real estate, zoning, litigation, environmental, and government attorney based in Walnut Creek, California. They have 19+ years of legal experience, licensed to practice since 2007. Admitted to practice in California (2007). Educated at University of California, Berkeley School of Law (J.D., 2007) and Jurisprudence Awards in Contracts and Criminal Procedure Prosser Awards in Intellectual Property and Civil Procedure Order of the Coif. During law school, Sean also worked with the criminal d (M.A. Brandeis, 2004). Active member of Associations American Bar Association Bay Planning Coalition - Former Board Member Contra Costa County Bar Association Urban Land Institute. Serands clients in Walnut Creek, CA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Sean Ryan Marciniak is a lawyer practicing entitlement, environmental, land use & ceqa and 5 other areas of law
  • Sean received a degree from Jurisprudence Awards in Contracts and Criminal Procedure, and has been licensed for 19 years
  • Sean practices in Walnut Creek, CA

Practice Areas Explained

Sean Ryan Marciniak's Areas of Practice

Each practice area below reflects the types of cases Sean Ryan Marciniak handles, with a brief overview of what that area of law covers.

Real Estate Law

Real estate attorneys handle home purchases, sales, commercial transactions, title disputes, and landlord-tenant matters.

Sean Ryan Marciniak is one of 316,149 real estate attorneys indexed nationally. Browse real estate attorneys in California →

Land Use & Zoning

Sean Ryan Marciniak is one of 40,226 zoning attorneys indexed nationally. Browse zoning attorneys in California →

Civil Litigation

Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.

Sean Ryan Marciniak is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in California →

Environmental Law

Environmental attorneys for regulatory compliance, contamination, land use, and natural resource law.

Sean Ryan Marciniak is one of 56,434 environmental attorneys indexed nationally. Browse environmental attorneys in California →

Government & Administrative Law

Attorneys for administrative law, agency hearings, government contracts, licensing, and public benefits.

Sean Ryan Marciniak is one of 132,225 government attorneys indexed nationally. Browse government attorneys in California →

Jurisdictional Context

Why local counsel matters in California

Practicing law in California. Legal matters in California are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Walnut Creek are typically filed in the local municipal court or the appropriate California state district court, depending on subject matter and amount in controversy. An attorney licensed in California brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in California courts without local counsel or pro hac vice admission.

Looking for additional California attorneys? Browse all attorneys in Walnut Creek or all attorneys in California.

Frequently Asked

Common questions about Sean Ryan Marciniak

Where is Sean Ryan Marciniak's law office located?
Sean Ryan Marciniak's law practice is located in Walnut Creek, California. You can contact the office directly through this profile page.
What practice areas does Sean Ryan Marciniak handle?
Sean Ryan Marciniak focuses on real estate, zoning, litigation, environmental, government. Each practice area listed reflects experience handling cases of that type in California.
How long has Sean Ryan Marciniak practiced law?
Sean Ryan Marciniak has 19+ years of legal experience and has been licensed since 2007.
Where did Sean Ryan Marciniak go to law school?
Sean Ryan Marciniak earned their education at (J.D., 2007); (M.A. Brandeis, 2004).
How can I contact Sean Ryan Marciniak for a consultation?
You can contact Sean Ryan Marciniak directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.

Education

J.D.
University of California, Berkeley School of Law
- 2007
M.A. Brandeis
Jurisprudence Awards in Contracts and Criminal Procedure Prosser Awards in Intellectual Property and Civil Procedure Order of the Coif. During law school, Sean also worked with the criminal d
- 2004

Bar Admissions

California
Admitted: 2007

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