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Department of Health Services

Department of Health Services Executive Team


Interim Director Tina Rivera

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Tina Rivera, an experienced administrator for more than 25 years in government and nonprofit work, was named interim director of the Sonoma County Department of Health Services (DHS) by the County Administrator on May 4, 2021. 

Tina Rivera joined DHS in January of 2020 as the Assistant Director and supported the work of both Health Services and the Community Development Commission (CDC). As Interim Director, she takes over a County department that has played a major role in responding to the COVID-19 pandemic and homelessness emergency. Through her leadership, Tina will continue the work of improving health equity for Sonoma County residents through community partnerships by focusing on key factors that influence health, including health system effectiveness, the built environment, and social determinants such as education and income.

Prior to joining DHS, Tina served as the Administrative Services Director for Sonoma County Human Services Department (HSD) overseeing their Finance and Operations units. Prior to joining the County in 2018, Tina was the Administrator & Chief Financial Officer for the state of Louisiana’s Department of Health’s Louisiana Human Services District northwest region. She has also served as the Executive Director of Programs for the Compassion Center of Shreveport, Louisiana, where she worked on developing and implementing housing and youth programs and strategies to provide housing supports and services for vulnerable populations.  Her life skills and mentor work with the local juvenile detention center earned the agency an “angel award”.

Tina has a Bachelor’s of Science degree from Northwestern State University in Business Administration and graduated from Louisiana State University with a degree in finance. Tina’s career spans over 25 years in administration, program and financial management, and accounting.


Assistant Director, Emilia Gabriele, M.Sc. 

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Emilia Gabriele has served as the Department's Assistant Director since June of 2020. Prior to that, she was the Chief Financial Officer (CFO) for the Department since July 2019. In her Assistant Director role, she supports the Director in the administration, operation and oversight of Health Services and serves as a lead member of the Department's Executive Management Team.

Emilia comes to DHS as an executive with over a decade of experience leading the financial operations of government-funded programs in the public and nonprofit sectors. Most recently, she was with Contra Costa County serving as CFO for the Employment and Human Services Department where she lead a team of 45 employees.

A Canadian native, Emilia has a Master in Science (M.Sc.) degree with concentration in finance and a Bachelor's degree in Business Administration with concentration in finance and economics from the Universite de Montreal's business school, HEC Montreal. She is a California licensed Certified Public Accountant (CPA), a Certified Management Accountant (CMA) and a Chartered Financial Analyst (CFA).

Most notably, Emilia a was a finalist for the Women Who Mean Business Award in 2013 and 2014 and a finalist for the CFO of the Year Award in 2013 by the San Diego Business Journal.

Health Officer  Dr. Sundari R. Mase, MD, MPH


Dr. Sundari R. Mase began serving as the County’s Health Officer March 2020. Dr. Mase brings local, state, federal and international experience to Sonoma County most recently serving as an independent Tuberculosis (TB) consultant for all aspects of TB clinical, programmatic and research activities; prior to that she was the India Country TB Medical Officer for the World Health Organization (WHO).

She received her undergraduate degree from the University of California, Berkeley (UCB) and her medical degree from the University of California, San Francisco (UCSF). She finished her residency in Internal Medicine at UCSF and, subsequently, obtained her Master of Public Health with an emphasis in Epidemiology at UCB. She is an Assistant Clinical Professor in the Infectious Disease Department at Emory University and served as Associate Clinical Professor at UCSF.

The County Health Officer is responsible for the protection and promotion of the public's health for all in Sonoma County. She will oversee the work of the DHS Public Health Division located at 625 Fifth Street in downtown Santa Rosa as well as work with other departments, community partners and other counties to improve health on both a programmatic and a policy level.

Behavioral Health Director, Bill Carter, LCSW 

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Bill Carter, LCSW, has been serving as the Department’s Behavioral Health Division Director since November 2018. Bill has a wealth of experience in and is recognized as a statewide expert in the mental health field.

Bill leads day to day operations at the Behavioral Health Division and oversees the division’s programs and services, including the Crisis Stabilization Unit (CSU) and Mobile Support Team (MST). Bill’s expertise has been invaluable as the County redesigns its behavioral health system as well as addressing a number of fiscal and operational goals that are crucial to meet for the sustainability of the division.

Carter has more than 30 years of experience in mental health and social services programming as a provider and administrator for both private and public sectors. He was an administrator at the California Institute for Mental Health (CIMH) from 1998 to 2010, designing and implementing program improvements and leading efforts to circulate evidence-based practices in the field.


Human Services Manager, Mari Cook  


Mari Cook has served as the DHS Human Resources Manager since January 2019.  As the Human Resources Manager for the Department, Mari is responsible for overseeing the day to day operational management of the Human Resources Unit, including employee/labor relations, performance management, organizational development and training, payroll, and general administration. Mari helps establish policy priorities, procedures, goals and objectives; consult with County HR, division heads and managers; and advise the department leadership in the formulation of HR policies and practices. She is familiar with the various laws, policies, programs and regulatory issues relating to the business practices of government and best practices in the field of Human Resources.

Mari comes to DHS as an experienced Human Resources manager with over twenty-five years of experience in human resources and employee and labor relations at the University of California. Most recently she was employed with the Lawrence Berkeley National Laboratory where she was a key member of the leadership management team, and responsible for formulating Human Resources' multi-year strategic plan, developing metrics, and effectively providing leadership and management of Human Resources operations. Mari graduated with a Bachelor’s degree in International Relations from UC Davis.


Chief Financial Officer, Paul Wood, MBA


Paul comes to DHS most recently from Santa Rosa Community Health where his leadership and analysis of finance and operations helped them remain fiscally sustainable through multiple wildfires and Covid-19 challenges. He has 17+ years of experience in corporate strategy and analysis, successfully improving cost and revenue in the business and non-profit sectors and making them financially sustainable organizations. He also brings with him over 10 years of management and leadership in both corporate and non-profit organizations.

Paul's leadership as CFO will be integral to support DHS' fiscal operations, maintain and enhance financial integrity, and support the Department's efforts to protect and promote health and wellness in our community. As CFO, he will manage the fiscal unit, and further develop our financial analysis, planning, reporting and risk management operations. As a member of the executive team, he will participate in strategic planning and ensure financial alignment and oversight.

He obtained a Bachelor's degree in Economics, and an MBA focused on C-level executive management from Sonoma State University.

Health Care Privacy and Security Officer, Ken Tasseff 


Ken Tasseff has served as the Healthcare Privacy and Security Officer for the County of Sonoma since April 2018.  In his role with the County, he works within DHS where he also oversees Medical Records.  He is a Certified Compliance Officer and holds certifications in Healthcare Privacy Compliance, Healthcare Research Compliance with the Health Care Compliance Association.  He has extensive experience in all phases of health care compliance and is recognized across the state as an expert in public sector healthcare privacy compliance.

Prior to Sonoma County, Ken he spent five years as the Health Agency’s first Compliance Officer and Privacy Officer, developing a program that was recognized for excellence by the State.  Prior to managing compliance programs, he was a public sector Human Resources Manager with over 10 years of experience in various HR roles.  Ken is a graduate of the University of California, San Diego with a degree in Management Science and is an active member of the California Association of Privacy, Security and Compliance Officers.

Compliance Officer, Wendy Sanders, LCSW 

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Wendy Sanders, LCSW, CHC has worked for the Department since 2006, and has served as the DHS Health Care Compliance Officer since 2015.  In her role as Compliance Officer, Wendy is responsible for administering an effective Health Care Compliance Program, ensuring regulatory compliance that includes, implementing written compliance policies, establishing compliance oversight, implementing effective lines of communication with staff, internal monitoring and auditing, staff training, and responding to compliance issues.

Wendy holds a Bachelor of Science in Psychology and a Master of Social Work.  She is a Licensed Clinical Social Worker, and holds a certification in Healthcare Compliance with the Health Care Compliance Association.

Wendy has worked over 25 years in the field of Health Care regulatory management in both the private and public sectors.  Prior to her current role as Compliance Officer, she worked for nine years in the DHS Behavioral Health Division as the Quality Improvement Manager, focusing on access, quality, timeliness, and outcomes of services to people with mental health and substance use issues.   Wendy also previously served as the DHS Privacy and Security Officer and Risk Manager.  Wendy is an active member of the California Association of Privacy, Security and Compliance Officers.