Atty. William Joseph Diffenderfer

Atty. William Joseph Diffenderfer

William Joseph Diffenderfer is a lawyer practicing insurance defense, mediation, arbitration and 1 other area of law. William received a B.A. degree from University of California at Santa Barbara in 1979, and has been licensed for 43 years.

Mission Viejo Mission Viejo 43 Years Experience 43 year
Call (657) 445-3756

Profile Summary

About William Joseph Diffenderfer at a glance

William Joseph Diffenderfer is an Atty. based in Mission Viejo, California. They have 43+ years of legal experience, licensed to practice since 1983. Their practice focuses on litigation, insurance, and adr. Admitted to practice in California (1983). Educated at University of Oregon (J.D., 1982) and University of California at Santa Barbara (B.A., 1979). Recognitions include BV Distinguished. Serves clients in Mission Viejo, CA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • William Joseph Diffenderfer is a lawyer practicing insurance defense, mediation, arbitration and 1 other area of law
  • William received a B.A. degree from University of California at Santa Barbara in 1979, and has been licensed for 43 years
  • William practices in Mission Viejo, CA

Practice Areas Explained

William Joseph Diffenderfer's Areas of Practice

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

Civil Litigation

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

William Joseph Diffenderfer is one of 409,070 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 Joseph Diffenderfer is one of 109,871 insurance attorneys indexed nationally. Browse insurance attorneys in California →

Mediation & Arbitration

Mediators and arbitrators for civil, commercial, family, and employment dispute resolution.

William Joseph Diffenderfer is one of 67,021 adr attorneys indexed nationally. Browse adr 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 Mission Viejo 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 Mission Viejo or all attorneys in California.

Frequently Asked

Common questions about William Joseph Diffenderfer

Where is William Joseph Diffenderfer's law office located?
William Joseph Diffenderfer's law practice is located in Mission Viejo, California. You can contact the office directly through this profile page.
What practice areas does William Joseph Diffenderfer handle?
William Joseph Diffenderfer focuses on litigation, insurance, adr. Each practice area listed reflects experience handling cases of that type in California.
How long has William Joseph Diffenderfer practiced law?
William Joseph Diffenderfer has 43+ years of legal experience and has been licensed since 1983.
Where did William Joseph Diffenderfer go to law school?
William Joseph Diffenderfer earned their education at (J.D., 1982); (B.A., 1979).
How can I contact William Joseph Diffenderfer for a consultation?
You can contact William Joseph Diffenderfer 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 Joseph Diffenderfer received?
William Joseph Diffenderfer's notable recognition includes: BV Distinguished.

Education

J.D.
University of Oregon
- 1982
B.A.
University of California at Santa Barbara
- 1979

Awards

BV Distinguished

Bar Admissions

California
Admitted: 1983

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