William H. Parish

(209) 952-1992

William H. Parish

Veteran trial lawyer Bill Parish founded what is now PARISH GUY CASTILLO in 1987. With more than 34 years of experience handling exclusively civil trials and appeals, he has tried a wide-variety of cases, representing Fortune 500 companies, small businesses and individuals in matters ranging from complex business litigation to personal injury.

Throughout Bill’s career he has been lead counsel in litigation involving claims for hundreds of millions of dollars, including the successful prosecution and defense of multi-million dollar jury trials, court trials, and arbitrations. He has also served as lead counsel in over 75 appeals. Bill is admitted to practice before the United States Supreme Court and various federal courts.

Bill is active in several industry organizations, including the prestigious American College of Trial Lawyers (ACTL) and American Board of Trial Advocates (ABOTA). Both are invitation only and made up of experienced trial lawyers who have demonstrated excellence in practice, adhere to the highest standards of professionalism and ethical conduct and have been vetted by judges, opponents and peers. ACTL’s membership comprises only one percent of the total lawyer population of each state.


University of the Pacific, McGeorge School of Law, J.D., with distinction, Order of the Coif, 1980
    Associate Editor and Staff Member, Pacific Law Journal
California State University, Sacramento, B.A., Economics, 1977


  • Fellow, American College of Trial Lawyers
  • American Board of Trial Advocates
  • Traynor Honor Society
  • American Bar Association
  • State Bar of California
  • San Joaquin County Bar Association
  • Los Angeles County Bar Association
  • Founding Shareholder and Director, Community Business Bank
  • Director and Former President, San Joaquin County Chapter of the American Heart Association


  • Preeminent AV Rating, Martindale-Hubbell
  • Bar Register of Preeminent Lawyers, Civil Trial Practice and Appellate Practice
  • Northern California Super Lawyers, Business Litigation
  • Listed in National Business Edition of Super Lawyers for Business Litigation

Speaking Engagements:

  • Effective Voir Dire-Tips, No Tricks, Masters Series Presentation, San Joaquin County Bar Association, January 2015
  • Civility Matters, joint presentation with the American Board of Trial Advocates and the San Joaquin County Bar Association, 2014