Superior Court of California, County of Solano

Superior Court of California, County of Solano

ADR Panel Member Database

William Diffenderfer

William Diffenderfer - Woodruff Dispute Resolution Center

  • Mediation
  • Arbitration
  • Neutral Case Evaluation
  • Temporary Judge
2415 San Ramon Valley Blvd., #4337
San Ramon CA, 94583
Phone: (925) 588-1361
Fax: (866) 425-3460
  • Retired Judge
  • Non Attorney
  • Active CA Bar CA Bar Number: SB 107963
  • Actively engaged in the practice of law
  • Completed basic skills training course Total hours of Mediation Training: 48
  • Served as mediator or co-mediator on at least 10 matters
  • Fee Charged per Hour: 310
  • Languages Spoken:
  • Current Practice:
  • % Plaintiff Rep Now: 0
  • % Defendant Rep Now: 0
  • % Plaintiff Earlier: 0
  • % Defendant Earlier: 0
  • Business/Contracts
  • Personal Injury
  • Professional Malpractice
  • Real Estate
  • Construction Defect
  • Public Entity
  • Medical Malpractice
  • Contract Disputes
  • Insurance
Legal Experience:

Jan 09-Present WDRC Mediator/Arbitrator
2004-2008 Law Offices of William J. Diffenderfer San Francisco/San Jose, CA
Managing Attorney, Insurance Staff Counsel

1999-2004 Law Offices of Donald J. DeShaw / Law Offices of Carol L. Ventura Fairfield, CA Attorney/Assistant Managing Attorney, Staff Counsel

1982-1999 McNamara, Houston, Dodge, McClure & Ney Walnut Creek/ Fairfield, CA
Associate Attorney, Partner (1990-1999)


University of California, Santa Barbara B.A. (with Honors) 1979
University of Oregon J.D. 1982
Specialized mediation training (including 40 hour Rosenberg Mediation Course)
Professional Memberships/Affiliations
State Bar of California
US District Court (Northern and Eastern Districts of California)
Contra Costa, Solano County Bar Associations
Association for Dispute Resolution of Northern California
Resolute Systems, LLC Northern California Mediation Panel

Mediation Experience:

Mediation participant in hundreds of claims and cases over 25 year civil litigation career. Twenty years' experience as Mediator ( first as adjunct to regular litigation work and now full time) with several hundred Mediations and settlements.

Court ADR panels since 1990 and current ADR panel member in Alameda, Contra Costa, Santa Clara, San Mateo, Sacramento, Solano and Yolo Counties.

Day of Trial Settlement Mentor in Contra Costa County/ SF Bar Association Early Settlement Program panelist.

Some Mediation Participant Comments:

Mr. Diffenderfer quickly grasps complex issues of law and fact and, importantly, is able to measure the personalities of the participants and move within them effortlessly to place everyone at ease. Mr. Diffenderfer's gift as a mediator is to engage the trust of both counsel and claimants, so that all sides are confident that their points of view are understood and evenly presented.
-He brings the refreshing combination of hard work ethic, intelligence and honesty to the mediation process.
-"I was really impressed with his workup leading up to the mediation and his mediation style."
-He is adept at arriving at out-of-the box solutions in cases that have stalemated up to that point.
-His style is welcoming and friendly, yet he maintains a level of professionalism that makes everyone comfortable with his negotiations.

Civil Litigation Background:

Mr. Diffenderfer's civil litigation career began in 1982 with one of the largest law firms in Contra Costa County. Sixteen years later and after ten years in the firm's partnership, he began work as an attorney for a national insurance company. He was thereafter selected to manage company legal offices in San Francisco, San Jose and (on an interim basis) New York City. He has successfully tried cases to juries in various Bay Area Counties and his legal work took him to California Courts from San Diego to Eureka, the California Court of Appeals and Federal District Court.

He has served as continuing education presenter on a variety of topics to attorneys, paralegals, medical practitioners and claims organizations.

His previous legal work included matters involving:
Personal Injury--Automobile, motorcycle, truck, bicycle and pedestrian accidents---- Premises Liability, dog bite-- Public Entity Liability----Product liability, food contamination, toxic exposure---Professional Liability including Medical Malpractice and claims for malpractice involving insurance agents and brokers, realtors, architects and engineers----Construction Defect----Real Estate----Defamation and Privacy ---False Imprisonment, Assault and Battery----Contract and Business Disputes---- Work and Construction Site Injuries---Property Damage including fire loss, flood, crop and timber loss--- Insurance including insurance bad faith claims.

Rates / Fee Policies For all mediation and arbitration:

$290 per hour, including review and study time, split between the participating parties. Due 30 days from billing. No charge for travel or travel-related expenses. No set-up or administrative fees. No-non-refundable deposits. (One hour deposit requested in advance of mediation-fully refundable if less than one hour spent on matter by time of cancellation.)
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