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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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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. Before becoming the Managing Attorney at The Law Offices of Todd Landgren, he worked for several other prominent criminal and DUI firms in Orange County.

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 dozens of jury trials.

The Landgren Firm’s attorneys maintain the highest standards of performance, ethics, and responsibility with respect to their clients’ matters. Our unblemished records with the State Bar of California can be found on the official state website (

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
  • Personal Injury
  • 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
6 Questions Answered

Q. I got a citation for no licence and the citation says booking required. What will happen if i dont go to booking?
A: Yes! In most cases you would be required to book if you are convicted. Make sure to appear in court or have a private criminal defense attorney appear on your behalf. If you have or can get a valid license you may be able to gain a dismissal or reduction of the charge to an infraction.
Q. My brother made an illegal u-turn and chp pulled him over.i was not inside the vehicle but was arrested for dui
A: You have a not-driving defense. You will need a quality lawyer who will take the time to gather all the evidence and develop the defense. Obtaining patrol video, body-worn camera video and digital audio will be essential. You may also want to get sworn statement from your brother stating the facts.
Q. 3 priors, sentenced ,& now blew 0.08. wondering what he looking at for sentencing WithNo tolerance law,
A: It is possible to negotiate a wet reckless if the evidence supports it. However, a defendant with three prior convictions for DUI who is arrested for a fourth, is less likely to gain a more favorable negotiated disposition. If you are charged with a fourth DUI within 10-years you could be facing a felony DUI charge and an extensive jail or short prison term. I advise retaining a qualified lawyer who has extensive experience with defending DUI cases.
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Contact & Map
Duffy Law, PC
DUI & Criminal Defense
19782 MacArthur Boulevard
Suite 225
Irvine, CA 92612
Telephone: (949) 933-7556