Judge Sean Dabel

Judge Sean P. Dabel serves in Department 26 of the San Mateo County Superior Court, where he presides over serious criminal matters. He was elected to the bench on November 8, 2016, following a career as a Deputy District Attorney in the San Mateo County District Attorney's Office, where he prosecuted criminal cases. His pre-bench career is entirely rooted in criminal prosecution within the same county where he now sits as a judge. The cases publicly associated with Judge Dabel's courtroom reflect a docket concentrated in high-stakes criminal matters: the 2023 California mushroom farm killings case (in which the defendant maintained a not guilty plea as of February 2024), a Menlo Park woman sentenced in September 2024 for stabbing a co-worker, and a case involving a man who landed a stolen plane on Half Moon Bay. These cases span homicide, assault, and other serious felony charges, consistent with a Department 26 assignment focused on complex criminal litigation. Because no analyzed rulings, attorney observations, or ingested content are available, behavioral and decisional patterns cannot be drawn from case outcomes. What is established from public record is that Judge Dabel handles methodologically complex criminal matters — including competency proceedings and multi-charge felony cases — and brings a prosecutorial background to that work. Attorneys appearing before him should prepare accordingly for a judge with deep familiarity with criminal procedure from the prosecution side.

Attorneys appearing before Judge Dabel should account for his background as a former Deputy District Attorney in San Mateo County. His prosecutorial career means he has direct, hands-on familiarity with how criminal cases are built, what evidence looks like from the charging side, and how the San Mateo County DA's Office operates. Defense attorneys in particular should anticipate a judge who understands prosecutorial strategy and will not be easily misled by arguments that mischaracterize the evidentiary record or charging decisions. The cases on his public docket — including a high-profile homicide case and a competency proceeding — indicate that Judge Dabel manages complex, multi-phase criminal matters. Attorneys should arrive fully prepared on procedural posture, including the status of any competency findings, pending motions, and prior rulings in the case. Disorganized or underprepared appearances in cases of this complexity are a significant risk. Because no ruling analyses or attorney observations are available, specific argument styles or motion preferences cannot be identified from the data. Attorneys should focus on factual precision, procedural thoroughness, and clear command of the record. Given the serious nature of the cases on his docket, judges in this posture typically expect counsel to be ready to address substantive issues without delay.

• critical

  Master the Full Procedural History of Your Case

  Given the complexity of cases on Judge Dabel's docket — including multi-phase proceedings such as competency hearings and homicide trials — attorneys must arrive with a complete command of all prior rulings, hearings, and procedural posture. Gaps in knowledge of case history will be apparent to an experienced criminal bench.

• critical

  Prepare for Prosecutorial-Perspective Scrutiny

  Judge Dabel's background as a Deputy District Attorney means he understands how criminal cases are built from the charging side. Defense attorneys should anticipate informed scrutiny of arguments challenging prosecutorial decisions, and should ground such arguments firmly in the record and applicable law.

• important

  Review All Publicly Available Case Coverage for Docket Context

  The mushroom farm killings case and other high-profile matters on his docket have received news coverage. Reviewing that coverage provides context on how proceedings in his courtroom have unfolded and what issues have been litigated.

• important

  Prepare Thorough Sentencing Materials If Applicable

  The September 2024 sentencing in the Menlo Park stabbing case is among his documented matters. Attorneys with sentencing appearances should prepare comprehensive sentencing memoranda and supporting documentation, as his docket reflects active engagement with serious felony sentencing.

• important

  Identify Any Competency or Mental Health Issues Early

  News coverage references competency proceedings among his case types. Attorneys should identify and raise any competency or mental health issues at the earliest appropriate stage, as his courtroom has experience managing these proceedings.

• ›Arrive fully prepared on the procedural posture of your case — Judge Dabel's docket includes complex, multi-phase criminal matters where incomplete preparation is conspicuous.
• ›Ground all arguments in the factual record and applicable statutory or case law. His prosecutorial background means he will recognize arguments that mischaracterize the evidentiary record.
• ›Treat competency and mental health issues with procedural seriousness — his docket reflects experience with these proceedings, and they should be raised and briefed with care.
• ›Be precise about the status of any pending motions or prior rulings. In complex criminal cases, vague or imprecise representations about case history are a credibility risk.
• ›Maintain professional decorum consistent with a courtroom handling serious felony matters, including homicide cases that may involve victims' families and significant public attention.