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3880 Lemon Street
Suite 350
Riverside, CA 92501

951-683-1144 fax

San Diego
16870 West Bernardo Drive
Suite 330
San Diego, CA 92127

858-485-9412 fax


  • University of Southern California (B.S.)
  • University of the Pacific, McGeorge School of Law (J.D.)

Bar Admissions

  • California

Memberships and Affiliations

  • State Bar of California

William A. Diedrich


Practice Areas

Bill Diedrich, a partner in Atkinson, Andelson, Loya, Ruud & Romo’s Riverside and San Diego offices, represents school districts, community college districts, and other public agencies in all aspects of labor and employment law.

Having served for more than a decade as Chief Negotiator for school districts and community college districts throughout Southern California, Mr. Diedrich is experienced in using a traditional bargaining model, Interest-Based Bargaining (“IBB”) model, and hybridized bargaining models.  His labor representation includes all levels of the collective bargaining process, from pre-planning through impasse.  Additionally, his areas of practice include certificated and classified employee discipline, contract enforcement and arbitration, representation of employers before the Public Employment Relations Board, Department of Fair Employment and Housing, and the Office of Administrative Hearings, certificated and classified layoffs, merit systems, and general education law. 

Speaking Engagements/Trainings

Mr. Diedrich is a recognized trainer in all aspects of collective bargaining.  He lectures extensively before industry organizations such as CSBA, ACSA, SEAC, and CASBO.  Additionally, he is the collective bargaining trainer for the Inland Personnel Council, a consortium of public school districts, community college districts, and county offices of education located in Riverside and San Bernardino counties.  Mr. Diedrich also regularly presents before local and statewide organizations on a myriad of matters that are of interest to his public sector clients, including state-mandated sexual harassment training, ethics training, and Brown Act compliance training.

Mr. Diedrich is the co-creator of the firm’s “H.R. 101” training series, developed for new human resources administrators. 


Mr. Diedrich obtained his bachelor’s degree from the University of Southern California, where he was a Trustee Scholar, and his Juris Doctor from McGeorge College of Law, where he was valedictorian and graduated Order of the Coif.


Mr. Diedrich is the son of a retired teacher and school superintendent.  His parents met during labor negotiations when they sat on opposite sides of the table!  



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