Board of Directors

Nicolas Yañez


I was born in Fort Bragg, CA and raised in Guadalajara Mexico. I started working for the County of Sonoma Human Services Department in August 2006; however in 2009 I left the county and moved to Tianjin, China to study Chinese. I returned to Sonoma County in 2010 and continued to work for the Human Services Department.

I currently work in our Human Resources division as a Program Development Manager overseeing the Client Advocacy unit.


BIO Pic Low Res.jpg

David Worthington


I am the Fleet Operations Division Manager for the General Services Department and lead a Team of twenty-two people with a mission to provide safe, reliable and functional vehicles and equipment, maintenance, vehicle up-fitting, fuel, and quality fleet asset management services to customer departments and outside agencies in an effective and efficient manner which benefits the County and its' citizens.

I have spent a majority of my career in the private sector and came to work for the County in 2008. I earned a Bachelor's of Science Degree from the California State University of Sacramento in Business Administration and believe in lifelong learning which has resulted in more than sixty five certifications and licenses over my career.

As a volunteer I am fortunate to be a member of the Board of Directors for SCAMC, the East Bay Clean Cities Coalition and the Northern California Chapter of the Municipal Equipment Maintenance Association. I donate time and resources to help raise funds for charitable organizations such as the American Heart Association, the Speedway Children's Charities Sonoma County Chapter, and the Sonoma County Chapter of the United Way.  I also volunteer and provide technical expertise as an internationally licensed technical inspector/steward for regional, national and international motorsports competition series such as the American Federation of Motorcyclists, FIM Superbike World Championship, MotoGP World Championship and World Touring Car Championship.


Christine Williams

corresponding secretary

After many years working in the private sector, I was hired by the County of Sonoma in 2004 and became a SCAMC member in 2006 when I promoted to Department Analyst in the Sheriff’s Office. I’m currently the Administrative Services Officer II for the Probation Department. It was important for me to become involved with the SCAMC Board because I truly believe that Sonoma County managers are the smartest, hardest working and most dedicated group of individuals I’ve ever had the pleasure of working with, and I want our group to be supported and treated fairly. 


Sherry Bevens

Recording Secretary

Sherry Bevens is a project manager with Information Systems Department.  She has been with the County for the past 8 years.  During her tenure with the County, she has helped to implement the new PeopleSoft financial system.  Other enterprise applications under her domain of support include ePersonality, the County Human Resources and Payroll application, as well as Timesaver the time tracking system. 

She joined the SCAMC Board in January of 2016 and currently serves as the Recording Secretary



Terina Tracy


I have been with the County since 2008 after taking time away from professional life to raise and home-educate my two sons. Prior to my time off I had a 20-year career in banking.  While in banking I spent many years leading employee groups in an advisory capacity and managed several conversion and acquisition projects as the Team Leader. I was a Junior Achievement Advisor for many years and was part of the Santa Rosa Chamber of Commerce Loaned Executive Program. During my time at home I continued to be involved in activities in the community by volunteering for various charitable organizations and being elected as head of a women's non-profit group. Since joining the County in 2008, I have worked in the Auditor-Controller-Treasurer-Tax Collector’s Office on the HRMS Project, in the Payroll Division and in my current assignment in the Administration Division.

I joined the SCAMC Board in 2012 and have held the Treasurer position since 2015. I find my work with the managers in our organization to be one of the most rewarding parts of my job, it is my pleasure to serve in this capacity.

When not at work I enjoy spending time with my family and friends camping, waterskiing, hiking and cooking


Monique Chapman

Board Member

I have lived in Sonoma County most of my life, growing up in the beautiful Sonoma Valley. Currently I reside in Windsor and when not working, I enjoy spending with my family. Most days you will find me running or hiking (or both!).

I began my County career in 1997 with the Department of Child Support Services and also worked for the Probation Department. I have worked for the Sheriff’s Office since 2012 and I am currently a Program Manager overseeing the Civil Bureau. For the past four years, I served on the Upstream Investments Portfolio Review Committee. Having worked and promoted within the County over 18 years, I joined the SCAMC Board to take on a more proactive role with issues that impact managers.



Angela Silvestri

Board Member

Angela Silvestri is a Department Analyst with the Transportation and Public Works Department.  She began her county career in 2007 as an Account Clerk II in the Human Resources Department and worked her way up through the County ladder. 

Angela is a Sonoma County native graduating from Montgomery High and earning Bachelors of Arts in Anthropology and History from Sonoma State University.  When not at work she can be found training her dogs.


Mary Dodge.jpg

Mary Dodge

Board Member

Mary came to the Sonoma County Agricultural Preservation and Open Space District in April 2014 after spending 22 years as a City Finance Professional, including nine years as the Administrative Services Director, City Treasurer for the City of El Cerrito, CA.

Prior to that Mary was an auditor with the CPA firm Maze & Associates, which specializes in local government auditing and consulting. Prior to Maze & Associates, she was the Controller of the University Foundation at Chico State University and taught accounting.

Mary was on the Board of Directors of the California Society of Municipal Finance Officers for 2008-2011 and was Chapter Chair of the East Bay Chapter for many years. She has chaired the Annual Conference Site Selection committee, been Senior Advisor to the Membership Committee and was the Career Development Committees lead on the Performance Measures Project from 2002-07 providing statewide training and conference presentations.

Mary has a Bachelor of Science in Business Administration with an emphasis in Accounting from CSU, Chico and is currently an inactive Certified Public Accountant.


Susan Lyons Yu

Board Member

I originally joined the Sonoma County Water Agency in 1994 as a Technical Writing Specialist, extra-help. In 2000 I was promoted to Technical Writing Manager for the Water Agency; I lead a team of 7 Technical Writing Specialists. 

I’ve been heavily involved in SCAMC since 2007, and became a board member in 2011. I joined SCAMC to get to know, to support, and to be supported by my colleagues within the county family. I’ve been the recording secretary and a social committee member for SCAMC.  

Sonoma County has been home for most of my life. I grew up in Petaluma, and I attended Petaluma High School and Santa Rosa Junior College prior to earning my bachelors of science in applied mathematics at Cal Poly, San Luis Obispo. I absolutely love the beauty, incredible open spaces and hiking opportunities, food, wine, and craft beer that this great region provides. I have lived in my home in Santa Rosa with my family for the past 20 years.

Zoe Bagala.jpg

Zoe Bagala

Board Member

I started my career at the County in 2015 and am currently the Assistant Payroll Manager for the County working in the Auditor-Controller-Treasurer-Tax Collector Department.  I am new to SCAMC’s Board of Directors since the beginning of 2018. I wanted to be more involved with SCAMC after seeing what an integral part they played in communications with Admin Management. 

Sonoma County is home, I was born and raised here. After high school I moved to Marin and went to Dominican University where I played on the volleyball team and graduated with my Bachelor’s Degree in Business Administration. I have since moved back to Sonoma County and have continued my volleyball career now coaching a youth travel team. I truly love Sonoma County from the parks and beaches to our wine and community.

Justin Riedel

Board member

I started with the Sonoma County Sheriff’s Office in 2002 and I’ve continuously managed the Information Technology Unit and Computer Forensic Team. I was born and raised in Santa Rosa. I graduated from California State University Northridge (CSUN) with a Bachelor of Science in Business Administration with a focus in Management Information Systems (MIS). I started my IT career at Optical Coating Laboratory, Inc. (OCLI) in their Information Systems Department, later worked for California State University Northridge as a Helpdesk Administrator, and finally as the Manager of Information Systems at the LA Weekly and OC Weekly newspapers in Los Angeles before coming to the County of Sonoma.

I am a lifelong learner and hold various professional and technical certifications including isc2's Certified Information Systems Security Professional (CISSP) and a Microsoft Certified Solutions Associate (MCSA) along with being a “Challenge Coin” holder from the SANS Institute in the areas of Advanced Computer Forensics and Web Application Penetration and Ethical Hacking.

I joined the board of SCAMC in 2018. I believe in building strong professional bonds in organizations through effective communication and identifying common goals that lead to mutual success. When I am not working, I enjoy writing and recording music, running and hiking, and spending time with my family.