Board Meetings & Agendas

Supervisor Diane Burgis proudly serves the 222,000 residents of Contra Costa County’s 3rd Supervisorial District, including Antioch, Bethel Island, Brentwood, Byron, Discovery Bay, Knightsen, and Oakley in East Contra Costa County.

She was elected to office in 2016 and re-elected in 2020 and 2024.

Diane serves on over 30 Board of Supervisor and regional committees, including as Chair of the Legislation Committee; Internal Operations Committee; and the Transportation, Water & Infrastructure Committee. As Chair of California’s Delta Protection Commission, she also serves as its representative on the State’s Delta Stewardship Council.

Diane’s priorities include protecting and enhancing the Delta ecosystem and water quality; promoting public safety with improved fire protection and law enforcement coverage; addressing the homelessness and housing affordability crisis; improving mental health response; bringing more services to East County; and building our local economy to bring jobs closer to home.

Prior to being elected to the Contra Costa County Board of Supervisors in 2016, Diane served as a trustee on the East Bay Regional Parks District Board, a member of the Oakley City Council, and as the Executive Director of Friends of the Marsh Creek Watershed.

Diane has called Contra Costa County home for most of her life. She raised her three sons in Oakley, and is a proud grandmother of two.

Dionne Adams is the Director of Diversity, Equity, Inclusion and Belonging at Pacific Gas & Electric Company headquartered in Oakland, CA. She has been with PG&E for over 20 years and served in roles of increasing responsibilities within human resources, supply chain responsibility, regulatory affairs, and customer care line of business functions.

In her current role, Dionne provides strategic oversight of the company’s DEIB strategy focused on creating and sustaining a work environment where every member of their 25,000 person workforce feels known, loved and proud to work with and for PG&E.

In the community, she serves as an elected City Councilmember for her hometown of Pittsburg and as an Advisory Board Member of Tri-Delta Transit. In these roles Dionne works to drive equity and inclusion for members of the community in the areas of job creation, housing, public safety and accessibility.

Dionne is a California native and holds a Master of Public Administration from Golden Gate University and a Bachelor of Science of Business with an emphasis in Marketing from San Francisco State University.

Shanelle Scales-Preston was elected to the Pittsburg City Council in 2018 and served as Mayor 2023. Her priorities have been to strengthen youth programs and improve city services to create a strong and vibrant community. In 2024, she was elected to fill the seat of retired Contra Costa County Supervisor Federal Glover, and became the first women and women of color to do so.

Pittsburg is Shanelle’s home and has shaped who she is today. Her father owned a small business and was a member of UA 342 and her mother worked at the local glass factory. She understands the day-to-day struggles we all face. Shanelle’s strong ties to the community are built from her relationships with neighbors, her church and the organizations she volunteers for, including the Gateway Rotary Club and the Pittsburg Reads initiative.

Shanelle has extensive regional experience. She is Chair of the Board for MCE, the local electricity provider, is Chair of TransPlan which coordinates regional transportation projects and transit services in East County and is President of the League of California Cities East Bay Division.

Our community’s strength lies in its diversity and Shanelle has worked to ensure every voice is heard and valued. Her community service started in the federal government more than twenty years ago where she learned to effectively advocate for residents and local governments navigating difficult bureaucracies and fix problems. Shanelle has worked in communities across Contra Costa County her entire career and has built lasting relationships with residents here.

Shanelle earned her degree from California State University East Bay. She and her husband are raising their two sons in Pittsburg.