Mediation Experience:

Mediation participant in hundreds of claims and cases over 25 year civil litigation career.  Over twenty years’ experience as Mediator ( first as adjunct to regular litigation work and now full time) with over 1500 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.

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)

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/work and construction site injuries, dog bite, premises liability—-Public Entity Liability—-Product Liability, food contamination, toxic exposure—Professional Liability including Medical Malpractice and insurance professionals, realtors, architects/engineers—-Construction Defect—-Real Estate—-Defamation and PrivacyFalse Imprisonment, Assault and Battery—-Contract and Business Disputes-—-Landlord/Tenant–Property Damage including fire loss, flood, crop and timber loss— Insurance including insurance bad faith claims.

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


Practice AreasPersonal Injury, Business, Real Estate, Professional Liability, Employment, Insurance
Office2415 San Ramon Valley Blvd #4337
San Ramon CA 94583


Monday - Friday8:00 pm - 5:00 pm

Service details

Date:June 19, 2015