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San Mateo County Sheriff Ken Binder selected longtime sheriff employee Frank Dal Porto as assistant sheriff of corrections and Mark Myers as assistant sheriff of operations.
Dal Porto most recently served as captain of the Sheriff’s Office Headquarters Patrol Bureau, where he acted as chief of police services for Portola Valley and Woodside, which contract with the county, and for unincorporated communities including North Fair Oaks and West Menlo Park.
As assistant sheriff of corrections, Dal Porto will oversee the county’s two adult correctional facilities — the Maguire Correctional Facility and the Maple Street Correctional Center. The facilities housed an average daily population of 1,253 people in 2025, according to the Sheriff’s Office. In recent years, the corrections division has faced scrutiny over multiple in-custody deaths during the tenure of former Sheriff Christina Corpus.
Dal Porto joined the Sheriff’s Office in 1998 as a correctional officer and has held leadership roles in both custody and patrol operations, including overseeing Maple Street and managing major capital projects such as the 2024 move to the Sheriff’s Office headquarters building.
“I’m grateful for the opportunity to serve as assistant sheriff and see it as a true privilege and honor to be entrusted with leading the corrections division,” Dal Porto said in a statement. “I look forward to serving our employees, the community and incarcerated persons with integrity and a continued commitment to professionalism and safety.”
Binder announced Dal Porto’s promotion alongside the appointment of Myers as assistant sheriff of operations. Myers will oversee patrol services and investigations for contract cities and unincorporated areas countywide, as well as the Sheriff’s Office Transit Bureau, which provides law enforcement services for Caltrain.
“I’m very excited to continue serving our contract cities and unincorporated communities in this new role alongside the incredible men and women of the San Mateo County Sheriff’s Office,” said Myers in a statement.
Both promotions took effect Jan. 18.
