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Trusted Legal Representation in Walnut Creek
O'Connor, Runckel & O'Malley is a law firm dedicated to providing zealous representation in personal injury, criminal defense, and DUI cases. With over 90 years of combined courtroom experience, our attorneys bring unparalleled trial expertise and a proven track record of success. As former Contra Costa County prosecutors and a retired Superior Court Judge, we leverage unique insights into prosecutorial strategies and judicial perspectives to benefit our clients. Our commitment to justice is demonstrated through aggressive advocacy, strategic negotiations, and meticulous case preparation. We serve clients throughout the San Francisco Bay Area, prioritizing personalized attention and transparent communication.

Our team retains top experts in medical, engineering, and legal fields to maximize recoveries in complex cases. With a focus on both civil and criminal matters, we combine education, practical knowledge, and decades of experience to deliver exceptional legal outcomes. Our reputation for excellence stems from handling over 250 jury trials and thousands of negotiated settlements, establishing trust through consistent results. We maintain strong relationships with judges and prosecutors across the region, enhancing our ability to secure favorable resolutions. From initial consultation to case resolution, we ensure clients receive comprehensive support and informed guidance tailored to their specific needs.
Services
Personal Injury Criminal Defense DUI Defense Wrongful Death Car Accidents
Highlights and features
  • We offer 90+ years of combined courtroom experience from former prosecutors and a retired judge
  • Our team has tried over 250 jury trials across civil and criminal cases
  • We maintain exclusive relationships with top medical and forensic experts for case preparation
  • Our attorneys negotiate superior settlements through proven prosecutorial insight
  • We provide personalized case management from initial consultation to resolution
What people say
Best attorney around Dedicated and knowledgeable Excellent experience Exceptionally smart attorneys Truly care about their work
Services
Personal Injury
Our personal injury practice secures compensation for clients harmed by negligence. We handle auto accidents, traumatic brain injuries, and wrongful death cases with comprehensive investigation and expert testimony. Our attorneys leverage decades of trial experience to maximize recoveries through settlements or litigation, focusing on medical expenses, lost wages, and emotional distress compensation.
Criminal Defense
We defend clients facing felony and misdemeanor charges with insider prosecutorial knowledge. Our strategies address DUI, drug offenses, domestic violence, and white-collar crimes. Former deputy district attorneys and a retired judge provide unique insights into case-building and negotiation tactics to reduce or dismiss charges while protecting constitutional rights.
DUI Defense
Specialized DUI defense includes challenging blood alcohol testing, procedural errors, and license suspension hearings. Our team uses former prosecutorial experience and forensic experts to contest evidence while navigating DMV requirements. We handle first-time offenses through vehicular manslaughter cases with strategic courtroom advocacy.
Wrongful Death
We represent families in wrongful death litigation from accidents or medical negligence. Our approach quantifies economic losses and emotional damages while proving liability through accident reconstruction and expert witnesses. We negotiate with insurance companies or litigate to secure compensation for funeral costs, lost income, and companionship.
Car Accidents
Car accident cases focus on liability determination and damage recovery. We handle insurance disputes, uninsured motorist claims, and complex collisions involving trucks or motorcycles. Our investigation includes accident scene analysis and medical documentation to establish fault and secure compensation for injuries and property damage.
People
Thomas M. O'Connor
Attorney
Former Contra Costa County prosecutor with 30+ years of trial experience. Specializes in personal injury and DUI defense, known for aggressive courtroom advocacy and high-profile case settlements.
Jason O. Runckel
Attorney
Experienced criminal defense attorney and former deputy district attorney. Handles complex felony cases and DUI defense with a focus on procedural challenges and evidence suppression.
William Daniel O'Malley
Attorney
Retired Contra Costa County Superior Court Judge with unique bench perspective. Specializes in wrongful death cases and serves as strategic advisor in complex litigation and settlements.
Questions
What areas do you serve?
We serve all San Francisco Bay Area counties including Contra Costa, Alameda, Marin, Napa, and Sonoma with office locations in Walnut Creek and Sacramento.
What experience do your attorneys have?
Our attorneys have over 90 combined years of experience, including 250+ jury trials as former prosecutors and a retired Superior Court Judge.
Do you offer free consultations?
Yes, we provide free initial consultations for all personal injury and criminal defense cases with no obligation.
How are fees structured?
Personal injury cases are handled on contingency basis; criminal defense uses hourly billing with transparent cost explanations during consultation.
Can you handle complex cases?
Our team specializes in complex cases involving traumatic injuries, wrongful death, and felony charges with proven trial and negotiation success.
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