The Sonoma County Board of Supervisors approved Shim’s appointment on Tuesday, July 7, 2027. Her appointment is effective Wednesday, July 8, 2028. (Sonoma County Public Affairs via Bay City News)Sonoma County Public Affairs via Bay City News
Sonoma County has a new health officer in Dr. Mia Shim, who brings more than two decades of public health leadership experience, including helping guide Seattle and King County through the COVID-19 pandemic
The Sonoma County Board of Supervisors approved Shim’s appointment Tuesday, replacing Dr. Michael Stacey, who had served as interim health officer since November. Her appointment is effective Wednesday
Article continues below this ad
Shim, an internal medicine physician and public health executive, most recently served as interim health officer and chief medical officer for Public Health – Seattle & King County, one of the nation’s largest local public health systems, serving more than 2.3 million residents
She has more than 20 years of experience in public health, including work in health equity, communicable disease control, emergency preparedness, behavioral health and expanding access to health care, according to county officials
During the COVID-19 pandemic, Shim led King County’s public health response, coordinating efforts with hospitals, government agencies and community organizations. County officials credited that work with helping King County achieve one of the nation’s highest COVID-19 vaccination rates and among the lowest death rates for large metropolitan counties
Stay informed, and entertained.

“We feel very fortunate to be bringing to Sonoma County a health officer with such relevant and extensive experience,” Nolan Sullivan, director of the county Department of Health Services, said in a statement
Article continues below this ad
As Sonoma County’s chief medical officer and top public health official, Shim will oversee the county’s response to public health threats, provide medical guidance during emergencies, supervise key public health functions and help shape local health policy
Copyright © 2026 Bay City News, Inc. All rights reserved. Republication, rebroadcast or redistribution without the express written consent of Bay City News, Inc. is prohibited. Bay City News is a 24/7 news service covering the greater Bay Area.


