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Elections / Offices / San Mateo County Superior Court Judge — Office No. 5

San Mateo County Superior Court Judge — Office No. 5

June 2026 California Primary June 2, 2026 Upcoming

AI Race Summary

The only contested Superior Court seat on the June 2 ballot in San Mateo County. The seat opened with the retirement of Judge Susan Greenberg. Both candidates are career prosecutors. (The other eight Superior Court seats up in 2026 — Offices 1, 2, 3, 4, 6, 7, 8, 9 — drew no challengers and per California law are removed from the ballot; the unopposed incumbents are deemed elected.)

Candidates · sorted by endorsements

Brian Donnellan

Brian Donnellan

No Party Preference · San Mateo County Deputy District Attorney

Veteran prosecutor with more than 20 years in the San Mateo County DA's office. Iraq War veteran. Born in Ireland; moved to San Mateo County in 1983 in fourth grade (his father was president of Notre Dame de Namur University in Belmont; his mother served as a deputy treasurer in San Mateo). Campaign pitch is local roots and trial experience, and he has highlighted endorsements from every sitting San Mateo County Superior Court judge.

Jay Boyarsky

Jay Boyarsky

No Party Preference · Chief Assistant District Attorney, Santa Clara County

32-year career attorney; UC Berkeley School of Law (1991). Began at the SF firm Steefel, Levitt & Weiss before joining the Santa Clara County DA's office, where he is now second-in-command. Palo Alto resident. Previously ran for Santa Clara County Superior Court in 2024, losing to Johnene Stebbins.