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About Me

William is a trial lawyer who has handled a wide variety of business litigation cases in state and federal court, as well as before various administrative agencies. He has also argued before federal and state courts of appeal. Among others, he has handled cases involving claims of trademark infringement, patent infringement, copyright infringement, unfair competition, misappropriation of trade secrets, breach of contract, fraud and false claims, wrongful termination, disputes arising in the sales of businesses, securities litigation before FINRA, real estate disputes, mortgage fraud litigation, and insurance-related matters. His cases have been the subject of news media reports, including major newspapers and television. Most recently, William conducted three separate jury trials in which he obtained defense awards for his clients – one a renowned baker accused by another restaurant/bakery of violating a covenant not to compete, another an entrepreneur accused of committing fraud in a large telecommunications deal with a large Vietnamese telecommunications company, and another an automobile wheel distributor who was accused of failing to pay for product manufactured, but untimely delivered, by a Taiwanese company.  He has also secured a $2.89 million verdict for an after-market automobile parts distributor in a trademark infringement suit against a Taiwanese company.  William also obtained a $1.2 million verdict against a doctor and a medical clinic in a False Claims Act/retaliatory employment termination case brought by an aggrieved employee.  Additionally, he has obtained multi-million dollar judgments in three separate cases against Ponzi-schemers; one for $86.5 million, another for $45 million, and another for $10 million.  He has also obtained numerous preliminary injunctions preventing parties from committing wrongful acts, writs of attachment preserving assets for collection, and orders appointing receivers to take control over and preserve personal property and/or real property in dispute.

Because of his litigation successes, William was named as a "Super Lawyer" in 2009, 2010 and 2011 in Southern California Super Lawyers Magazine (a publication of Los Angeles Magazine), having been recognized by his peers as one of the top lawyers in Southern California. He has also received the highest rating of “10” on AVVO since 2009, and has been recognized four times by OC Metro Magazine as one of Orange County’s top lawyers.


He is currently a member of the American Board of Trial Advocates, a prestigious association of trial attorneys.  He has also been invited to join the Million Dollar Advocates Forum, a register of attorneys who have obtained multi-million dollar judgments and verdicts.


William is very pleased to be working with Eric Schiffer, a talented lawyer not to mention a long-time friend. “In addition to being a superb lawyer and having extensive litigation experience, Eric brings a unique understanding of consumer finance, mortgage banking, and intellectual property. Because of him, we have a well-rounded litigation practice and can offer a wide variety of litigation and transactional services for our clients.”


William previously served on the Board of Directors for the Laguna Beach Chamber of Commerce, and was also the Chamber’s Secretary. He has been a judge pro tempore for the California Superior Court in Orange County, acting as a settlement officer for various types of disputes. He has also authored several articles on law practice for the Los Angeles Daily Journal, including articles on proving damages as well as getting and keeping the jury's attention. He was also on the staff of Southwestern University School of Law’s law review, and was invited to join Southwestern’s moot court honors program. William has also passed the Uniform Certified Public Accountant Examination in 1991.


Practice Areas


  1. Litigation: 40%
    20 years, 550 cases
  2. Securities & Investment Fraud: 25%
    14 years, 100 cases
  3. Trademark Infringement: 25%
    14 years, 100 cases
  4. Patent Infringement: 10%
    14 years, 50 cases


Payment Types:

Cash, Check, Credit Card

Attorney Endorsements

9 total 

  • Douglas James Pettibone

    I endorse this lawyer. William Buss is a hardworking gifted trial lawyer. He has strong skills and experience


    Douglas Pettibone Lawsuits & Disputes Attorney
    Relationship: Opposing Counsel on matter

  • Eric Martin Schiffer

    Bill is one of the finest lawyers I know. Bill is detail-oriented, intelligent, and understands client expectations. He is the person I always call when I need to consult on a case. I am proud to call him my law partner, and even prouder to call him my friend.


    Eric Schiffer Litigation Attorney
    Relationship: Co-worker

Contact Info

Lex Opus APC

3070 Bristol Street, Suite 530
Costa Mesa, CA, 92626



Professional Misconduct

We have not found any instances of professional misconduct for this lawyer.
Avvo Contributions
Legal Answers
Award NameGrantorDate Granted
Super LawyerSuper Lawyers Magazine2015
Top LawyerOC Metro Magazine2014
Top LawyerOC Metro Magazine2013
Top Orange County LawyerOC Metro Magazine2012
Super LawyerSuper Lawyers Magazine2011
Top Orange County LawyerOC Metro Magazine2010
Super LawyerSuper Lawyer Magazine2010
Top Orange County LawyerOC Metro Magazine2009
Super LawyerSuper Lawyer Magazine2009
Rising StarSuper Lawyer Magazine2006
Work Experience
TitleCompany NameDuration
ShareholderLex Opus APC2015 - Present
ShareholderSchiffer & Buus APC2010 - Present
ShareholderBuus Kim Kuo & Tran APC2006 - 2010
PartnerOswald & Yap APC2001 - 2006
AssociateNess & Associates1996 - 2000
Association NamePosition NameDuration
Consumer Attorneys Association of Los AngelesMember2013 - 2014
American Board of Trial Advocates (Los Angeles chapter)Member2012 - Present
Los Angeles County Bar AssociationMember2011 - Present
Orange County Bar AssociationMember2011 - Present
Laguna Beach Chamber of Commerce.Board Member, Secretary2005 - 2010
Legal Cases
Case NameOutcome
Garlich v. Town Center AssnJury Verdict for Defense
Stilwell v. DisneyJury Verdict for Defense
Velox v. JimrayJury Verdict for Plaintiff, $2.89 Million
See all Legal Cases 
Publication NameTitleDate
Los Angeles LawyerReclaim the Civil Right, Duty, and Power of Jury Service2013
Business Connection (Irvine Chamber of Commerce)Tips to Avoid Lawsuits2006
The Gavel (OCTLA)Proving Actual Damages in Real Estate Non-Disclosure Actions2005
Los Angeles Daily JournalLawyers Should Encourage Jurors to Question Witnesses2004
Los Angeles Daily JournalProving Loss of Profits is Daunting But Manageable2004
Los Angeles Daily JournalPlan Carefully to Discover Who Controls Corporation2004
Los Angeles Daily JournalGet Expert Help to Decide on Recoverable Damages2004
Common Assessment MagazineReduce Sidewalk Liability with a Maintenance Plan1998
School NameMajorDegreeGraduated
Southwestern University School of LawLawJD - Juris Doctor1995
California State University, Long BeachAccountingBA - Bachelor of Arts1991
Speaking Engagements
Conference NameTitleDate
Principals of the Carmack AmendmentCamack Amendment to the Interstate Commerce Act2000