Atty. William King O'Brien

Atty. William King O'Brien

William King O'Brien is a lawyer practicing business litigation, personal injury, insurance law and 1 other area of law. William received a B.S. degree from University of San Francisco in 1956, and has been licensed for 56 years.

San Francisco San Francisco 56 yrs experience 56 year
Call (415) 429-6850 Book Appointment

Profile Summary

About William King O'Brien at a glance

William King O'Brien is an Of Counsel based in San Francisco, California, practicing at Commins And Knudsen Professional Corporation. They have 56+ years of legal experience, licensed to practice since 1970. Their practice focuses on personal injury, business, litigation, and insurance. Admitted to practice in California (1970). Educated at University of San Francisco and San Francisco Law School (J.D., 1966) and University of San Francisco (B.S., 1956). Recognitions include AV Preeminent. Active member of Bar Association of San Francisco State Bar of California San Francisco Lawyers Club (Member, Board of Directors, 1976-1980) California Trial Lawyers Association California Attorneys for Criminal Justice The Association of Trial Lawyers of America. Serands clients in San Francisco, CA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • William King O'Brien is a lawyer practicing business litigation, personal injury, insurance law and 1 other area of law
  • William received a B.S. degree from University of San Francisco in 1956, and has been licensed for 56 years
  • William practices at Commins & Knudsen Professional Corporation in San Francisco, CA

Practice Areas Explained

William King O'Brien's Areas of Practice

Each practice area below reflects the types of cases William King O'Brien handles, with a brief overview of what that area of law covers.

Personal Injury

Personal injury attorneys help accident victims recover compensation for medical bills, lost wages, and pain & suffering. Most work on contingency — no fee unless you win.

William King O'Brien is one of 264,852 personal injury attorneys indexed nationally. Browse personal injury attorneys in California →

Business & Corporate Law

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

William King O'Brien is one of 501,317 business attorneys indexed nationally. Browse business attorneys in California →

Civil Litigation

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

William King O'Brien is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in California →

Insurance Law

Insurance attorneys for coverage disputes, bad faith claims, denied claims, and policy disputes.

William King O'Brien is one of 121,912 insurance attorneys indexed nationally. Browse insurance 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 San Francisco 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 San Francisco or all attorneys in California.

Frequently Asked

Common questions about William King O'Brien

Where is William King O'Brien's law office located?
William King O'Brien's law practice is located in San Francisco, California. The firm is Commins And Knudsen Professional Corporation. You can contact the office directly through this profile page.
What practice areas does William King O'Brien handle?
William King O'Brien focuses on personal injury, business, litigation, insurance. Each practice area listed reflects experience handling cases of that type in California.
How long has William King O'Brien practiced law?
William King O'Brien has 56+ years of legal experience and has been licensed since 1970.
Where did William King O'Brien go to law school?
William King O'Brien earned their education at (J.D., 1966); (B.S., 1956).
How can I contact William King O'Brien for a consultation?
You can contact William King O'Brien 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.
What awards or recognition has William King O'Brien received?
William King O'Brien's notable recognition includes: AV Preeminent.

Education

J.D.
University of San Francisco and San Francisco Law School
- 1966
B.S.
University of San Francisco
- 1956

Awards

AV Preeminent

Bar Admissions

California
Admitted: 1970

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