Atty. William John Cernius

Atty. William John Cernius

William John Cernius is a lawyer practicing securities offerings, corporate governance, securities / investment fraud and 4 other areas of law. William received a B.A. degree from University of Southern California in 1982, and has been licensed for 41 years.

Costa Mesa Costa Mesa 41 Years Experience 41 year
Call (626) 268-1613

Profile Summary

About William John Cernius at a glance

William John Cernius is a Partner based in Costa Mesa, California, practicing at Latham & Watkins LLP. They have 41+ years of legal experience, licensed to practice since 1985. Their practice focuses on business, m&a, securities, and consumer. Admitted to practice in California (1985). Educated at University of California, Hastings College of the Law (J.D., 1985) and University of Southern California (B.A., 1982). Serves clients in Costa Mesa, CA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • William John Cernius is a lawyer practicing securities offerings, corporate governance, securities / investment fraud and 4 other areas of law
  • William received a B.A. degree from University of Southern California in 1982, and has been licensed for 41 years
  • William practices at Latham & Watkins LLP in Costa Mesa, CA

Practice Areas Explained

William John Cernius's Areas of Practice

Each practice area below reflects the types of cases William John Cernius handles, with a brief overview of what that area of law covers.

Business & Corporate Law

Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.

William John Cernius is one of 452,854 business attorneys indexed nationally. Browse business attorneys in California →

Mergers & Acquisitions

William John Cernius is one of 45,724 m&a attorneys indexed nationally. Browse m&a attorneys in California →

Securities Law

William John Cernius is one of 58,852 securities attorneys indexed nationally. Browse securities attorneys in California →

Consumer Protection

Consumer protection attorneys for fraud, lemon law, debt harassment, and deceptive trade practices.

William John Cernius is one of 45,538 consumer attorneys indexed nationally. Browse consumer 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 Costa Mesa 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 venue, 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 Costa Mesa or all attorneys in California.

Frequently Asked

Common questions about William John Cernius

Where is William John Cernius's law office located?
William John Cernius's law practice is located in Costa Mesa, California. The firm is Latham & Watkins LLP. You can contact the office directly through this profile page.
What practice areas does William John Cernius handle?
William John Cernius focuses on business, m&a, securities, consumer. Each practice area listed reflects experience handling cases of that type in California.
How long has William John Cernius practiced law?
William John Cernius has 41+ years of legal experience and has been licensed since 1985.
Where did William John Cernius go to law school?
William John Cernius earned their education at (J.D., 1985); (B.A., 1982).
How can I contact William John Cernius for a consultation?
You can contact William John Cernius 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, Hastings College of the Law
- 1985
B.A.
University of Southern California
- 1982

Bar Admissions

California
Admitted: 1985

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