Kelley Drye & Warren Opens San Francisco Financial District Office

Two attorneys with unusually specific credentials in California's data-privacy ecosystem are now working out of 345 California Street in the Financial District, where Kelley Drye & Warren LLP quietly opened its first Northern California office on March 16.

Privacy Partner Kate Black spent years as the first head of privacy and data protection at 23andMe before joining the firm, where she focuses on privacy, AI, health technology, and what the firm describes as "cutting-edge innovation." Special Counsel Céline Guillou arrives with an equally specific pedigree: she was the first attorney hired by the California Privacy Protection Agency's Enforcement Division, where she reviewed consumer complaints and led investigations, then moved to Instacart as senior privacy counsel before landing at Kelley Drye.

The two form the opening roster of what managing partner Dana Rosenfeld told Law.com will grow to include litigators as well. Both Black and Guillou joined the firm's Privacy and Information practice group and will work with Bay Area clients on regulatory, AI, and health-technology matters.

The office itself is built for more than desk work. The firm designed the space at 345 California with flexible meeting rooms intended for client meetings, industry gatherings, and community events, positioning it as a place where the firm can engage locally rather than simply maintain a presence.

The San Francisco location is Kelley Drye's third office in California and its first outside Southern California, where it already operates in Los Angeles and San Diego. It is also the firm's third West Coast location overall. The opening continues a period of geographic expansion: the firm recently relocated offices to support growth in Washington, D.C., New Jersey, and Connecticut, and has a planned move to a new San Diego space still ahead.

Kelley Drye describes itself as an AmLaw 200 firm with more than 350 lawyers and other professionals, with additional offices in New York, Chicago, Houston, Parsippany, and Stamford. The San Francisco opening was recognized in 2025 when the firm earned a Law360 International Trade Practice Group of the Year designation, reflecting a broader push to add depth across practice areas.

For San Francisco's technology and health-data sectors, the arrival of two attorneys who built their reputations inside the institutions that now regulate them, one at the agency that enforces California's landmark privacy law, the other at a company that sits at the center of genetic-data policy debates, signals the kind of specialized depth that Bay Area companies navigating AI and health-tech regulation increasingly need close at hand.