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William Joseph Duffy

William Joseph Duffy

High Client Satisfaction with Proven Results!
  • DUI & DWI, Criminal Law, Personal Injury
  • California
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Michael Phillips
Michael Phillips December 5, 2018
Rating: 10 Lawyer Rating - 10 out of 10
Mr. Duffy possesses the requisite local knowledge, skill and focused expertise to create exceptional legal outcomes in his cases AND he employs those assets for his clients.
Client Reviews
S. H. January 15, 2021
You will not regret hiring Mr. Duffy and his team! In Mr. Duffy and his staff, you will find professional, knowledgeable, in-depth, and understanding support. When dealing with a legal matter, it is important to find someone that you can trust to care for you in the best way. I can promise you that Mr. Duffy will go above and beyond to help you resolve your matter is the quickest, most cost-effective way. Especially during this time, when so many are struggling; I cannot recommend Mr. Duffy's services more. Thank you so much to Mr. Duffy and his team for their help.
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As a former Certified Law Clerk for the Los Angeles County District Attorney, William Duffy has unique insight into the way the government handles criminal charges.

Mr. Duffy is an experienced and accomplished trial lawyer who concentrates his practice on general criminal and DUI defense in felony and misdemeanor cases. He represents a broad array of individuals at the investigative, pre-trial, motion and trial stages. His successes range from outright case dismissals and acquittals, to extremely favorable plea agreements. Mr. Duffy also has extensive jury trial experience in state court. Mr. Duffy is committed to making sure each client is satisfied with the result of his/her case. He has handled several newsworthy and high-profile cases.

Mr. Duffy’s experience in criminal defense runs the gamut – from felony DUI with Great Bodily Injury to drug possession and sales, firearms offenses, juvenile offenses, theft and fraud cases, embezzlement, and misdemeanor driving under the influence. He has negotiated thousands of cases and independently tried more than a dozen jury trials.

In William Duffy, you will have a defense attorney with extensive courtroom experience who takes the time to understand your unique circumstances and tip the scales of justice in your favor.

Practice Areas
    DUI & DWI
    Criminal Law
    Criminal Appeals, Drug Crimes, Expungement, Fraud, Gun Crimes, Internet Crimes, Sex Crimes, Theft, Violent Crimes
    Personal Injury
    Animal & Dog Bites, Brain Injury, Car Accidents, Construction Accidents, Motorcycle Accidents, Premises Liability, Truck Accidents, Wrongful Death
Video Conferencing
  • Google Meet
  • Zoom
  • Microsoft Teams
  • WebEx
  • Free Consultation
    We are happy to discuss your case with you and provide a realistic estimate of what you can expect from the Court and DMV based on your individual case.
  • Credit Cards Accepted
    We accept all major credit cards and check.
Jurisdictions Admitted to Practice
State Bar of California
ID Number: 248742
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  • English
Professional Experience
Managing Attorney
The Law Offices of Todd Landgren
Managing Attorney
Duffy Law, PC
- Current
Managing Attorney
Law Offices of Myles L. Berman
Managing Attorney
The Ticket Clinic
Shouse Law Group
Deputy Public Defender
San Bernadino County
Western State University College of Law
J.D. (2006)
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University of Montana
B.A. (1994)
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Clients' Choice Award
Top Attorney DUI, 10.0 Superb
Professional Associations
Newport Harbor Bar Association
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North Orange County Bar Association
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Orange County Bar Association
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National Association of Criminal Defense Lawyers
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West Orange County Bar Association
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California State Bar  # 248742
- Current
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Articles & Publications
California Criminal Law - Procedure and Practice
Websites & Blogs
Duffy Law, PC Website
Legal Answers
11 Questions Answered
Q. I have a past domestic violence record that was expunged. It was back in 2005. I would like to know if I can buy a gun?
A: 10-year Ban under California law from date of DV conviction. There is however a Federal lifetime ban on firearms.
Q. I am a victim of domestic violence but was never told I had to go to court, but my partner did. Do I still have to go?
A: You may not need to go to court unless there is a jury trial. However, finding your own representation can be essential whatever your position in regards to your partners case. In short, you may want to advocate for or against conviction of your partner. This can be accomplished with greater success using a Victim Right’s Attorney or a criminal defense attorney. If you suffered any injury as a result. A victim rights attorney can also help you obtain compensation to fully restore you.
Q. Got dui Didn’t complete classes Warrant issued 8 years later caught What will likely happen in court when I show up
A: Best strategy to hire a local attorney who can recall the warrant. Some courts will vacate the class, others may make you complete it now. Either way, probably no significant penalty, if any.
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Contact & Map
Duffy Law, PC
DUI & Criminal Defense
19782 MacArthur Boulevard
Suite 225
Irvine, CA 92612
Telephone: (949) 933-7556
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