About David D
David D Diamond is an attorney who has spent more than two decades working in criminal law and appellate practice. He earned a B.S. in International Relations from Michigan State University in 1991 and took his law degree from Southwestern Law School in 1998. Those academic roots framed an early interest in how law, policy and procedure intersect in courtroom settings.
After law school, Diamond built a practice that crosses trial and appellate work. He is admitted to the California bar and is also admitted to practice before the Ninth Circuit and the Federal Circuit. Over the years he has handled matters that required both state court litigation and federal appellate filings, moving documents and arguments through different levels of the judiciary.
Diamond has been involved in professional governance as well. Since 2001 he has served on the Board of Governors of California Lawyers for Criminal Justice. That role has kept him engaged with policy discussions, continuing legal education programming and peer review processes in the criminal law community. Serving on the board has placed him in conversations about legislative and procedural developments affecting criminal practice in California.
Colleagues describe him as steady in court and prepared in briefing. He approaches cases with a focus on procedure, precedent and persuasive written advocacy. That approach has been reflected in his handling of appellate briefs and in courtroom hearings where procedural detail matters as much as factual narrative.
His practice operates out of the Law Offices of David D. Diamond. There he handles a mix of matters that involve state criminal defense and federal issues that may require appellate work. He represents clients in trial court proceedings and prepares appeals when cases move up the ladder.
Outside the courtroom, Diamond continues to follow developments in appellate law and criminal procedure. He participates in professional gatherings and contributes to discussions on legal practice standards within criminal defense communities. Those activities have kept him connected to colleagues across California and federal practice circles.
As of 2026 he continues to practice at the Law Offices of David D. Diamond, representing clients in state and federal criminal matters and handling appeals in the Ninth and Federal Circuits.
