Judge Lucy Koh

Judge Lucy Koh presided over some of the most consequential technology cases in American history as a district judge in the Northern District of California — and now she's shaping tech law at the appellate level on the Ninth Circuit. She handled the landmark Apple v. Samsung patent trial ($539 million verdict), FTC v. Qualcomm (antitrust liability for patent licensing), and massive data breach class actions for Yahoo and Anthem. In 2021, she was confirmed to the Ninth Circuit, where she continues to address technology law issues.

For practitioners filing cases that may reach the Ninth Circuit: Judge Koh's tech litigation background means she understands the technical substance of AI cases in a way most appellate judges don't. Her experience with patent disputes, antitrust economics, and privacy litigation provides the framework through which she'll evaluate AI-related appeals. N.D. Cal.'s evolving AI disclosure requirements at the trial level will be reviewed through the lens of a judge who's spent her career in tech litigation.

Judge Koh's Tech Litigation Legacy in N.D. California

As a district judge from 2010 to 2021, Koh built one of the most impressive tech litigation records in federal judicial history. Apple Inc. v. Samsung Electronics was a global patent war that played out in her courtroom, resulting in a jury finding Samsung liable for $539 million in patent infringement. FTC v. Qualcomm involved allegations that Qualcomm violated antitrust law through its patent licensing practices — Koh found liability, though the Ninth Circuit later reversed. She also managed multidistrict litigation for the Yahoo and Anthem data breaches and handled Apple and Google privacy litigation. Each of these cases required deep engagement with how technology works — the exact skill set needed for AI cases.

The Ninth Circuit's Role in AI Law

The Ninth Circuit covers California, the epicenter of AI development. This means Judge Koh and her colleagues will likely be among the first appellate judges to address key AI legal questions: whether AI-generated outputs infringe copyrights, how antitrust law applies to AI market concentration, what privacy rights attach to AI training data, and how patent law adapts to AI-invented innovations. The Ninth Circuit has already addressed related issues — including questions about algorithmic discrimination and platform liability. Judge Koh's practical experience managing complex tech trials gives her a perspective that purely academic analysis can't replicate.

N.D. California's AI Disclosure Rules Under Appellate Review

As N.D. Cal. judges issue individual AI standing orders with varying requirements, the Ninth Circuit may eventually address whether these orders are enforceable, consistent, or constitutionally sound. Questions about whether mandatory AI disclosure chills attorney work product, whether different judges' conflicting requirements create due process issues, and how AI certification interacts with Rule 11 could all reach the appellate level. Judge Koh's decade of experience managing N.D. Cal.'s complex docket means she understands the practical implications of these trial-level rules — both for attorneys and for the courts that administer them.

Practical Implications for Practitioners

Step 1: If you're litigating in N.D. Cal. with an eye toward appeal, understand that the Ninth Circuit panel reviewing your case may include a judge with deep tech expertise. Don't assume the appellate court won't engage with technical details. Step 2: Build a clean trial record on AI issues. If AI tools were used in preparing filings or if AI is substantively at issue in your case, document everything — the Ninth Circuit will review the record closely. Step 3: For patent, antitrust, and privacy cases involving AI, study Judge Koh's district court opinions for her analytical framework. Her approach to market definition (Qualcomm), damages calculations (Apple v. Samsung), and data breach class certification (Yahoo/Anthem) will influence how she views AI cases on appeal.

Judge Koh's Background and Judicial Philosophy

Before the bench, Koh was a partner at McDermott Will & Emery in Palo Alto, specializing in patent, trade secret, and commercial litigation. She also served as an Assistant U.S. Attorney. She's the first Korean-American woman to serve as a federal appellate judge and the second Asian Pacific American woman on the Ninth Circuit from California. Confirmed by a 50-45 vote in December 2021, her appointment was politically significant. Her judicial philosophy combines a practical, case-management orientation from her district court years with a willingness to engage deeply with substantive legal questions. For AI law, this means she won't just defer to trial courts on technical issues — she'll dig into the substance.

The Bottom Line: Judge Koh brings unmatched tech litigation experience to the Ninth Circuit. If your AI-related case could reach the appellate level, study her district court opinions on patent, antitrust, and privacy law. Build a clean trial record on all AI issues. The Ninth Circuit will have judges who understand the technology — prepare accordingly.