Shanelle Scales-Preston

Building Bridges — One Community at a Time

"I love public service, and I've been doing it for 23 years — that's what drives me."

Supervisor Shanelle Scales-Preston — official portrait, royal blue blazer, Contra Costa County District 5, 2025
2025 First Black Woman Elected CC Supervisor
52.16% Vote Share — Nov 2024 General Election
23+ Years of Public Service
200 Affordable Housing Units Delivered in Pittsburg

Early Life & Context

Shanelle Scales-Preston has never left home — and that, she will tell you, is the whole point. Pittsburg, California shaped who she is before she had words for what she wanted to become.

Shanelle grew up as the daughter of a union tradesman — her father a proud member of UA Local 342, the plumbers and pipefitters union, who also ran a small business — and a mother who worked on the floor of a local glass factory. Theirs was a working-class household held together by labor, loyalty, and a deep belief that the community around you is either something you invest in or something you lose. She attended Pittsburg High School, and later earned her degree from California State University, East Bay — staying close to the place and people she would one day be elected to serve.

The Pittsburg she grew up in had three youth centers. By the time she was old enough to notice their absence, all three were gone. That absence planted something in her that would not be satisfied until she brought them back. She also watched her brother struggle with drug use and undiagnosed mental illness in a neighborhood where the line between survival and tragedy was thin — a family story that would become the fuel for her most important policy work decades later.

Pittsburg sits on the industrial northern waterfront of Contra Costa County — a community shaped by labor, manufacturing, and the kind of grit that comes from building something with your hands. It is a city of real people with real struggles, and Shanelle understood its rhythms before she understood politics. Today she and her husband are raising their two sons in the same city, attending her church, volunteering with the Gateway Rotary Club, and serving the Pittsburg Reads literacy initiative. The roots were always the point.

A Brother's Story — The Fire Behind the Policy

Shanelle has spoken openly about her brother's struggle with addiction and undiagnosed mental illness. He spent over eleven years in prison. When he was released, the support systems that should have wrapped around him were absent. In less than a year, in a moment of untreated mental health crisis, he took their father's life. In her own words: "I understand more services for mental health are still needed... Doing nothing or throwing people in jail doesn't help." This is not a story she hides — it is the reason she co-championed Contra Costa County's A3 crisis response program, and it is the reason she leads with empathy in every policy arena she touches.

Leadership Journey

Shanelle did not arrive at elected office by accident. She built a foundation — one federal district office, one constituent case, one community relationship at a time — for more than two decades before asking voters to trust her with the County Supervisors' seat.

1

The Congressional Classroom

Shanelle began her career as an intern to Congressman George Miller — one of the most consequential progressive voices California sent to Washington. When Miller retired, she transitioned to the office of Congressman Mark DeSaulnier, working as District Director for California's 10th Congressional District. For 23 years, her desk was where constituents came when the federal government had failed them — IRS disputes, immigration tangles, Social Security crises, student loans, healthcare access. She became a master of navigating bureaucracy on behalf of real people.

2

City Council Champion

Elected to the Pittsburg City Council in 2018 and reelected, Shanelle spent six years transforming her hometown from the inside. She delivered 200 units of affordable housing, reopened the youth center that had been dark for years, launched summer jobs programs, and worked with East Bay Regional Park District to connect police and youth through community hiking programs. She facilitated the county's first new hotel in years — a Courtyard by Marriott — and approved a 40,000 sq ft competition gymnasium so families no longer had to drive hours for tournaments.

3

Mayor of Pittsburg

In 2023, her council colleagues elevated her to Mayor of Pittsburg — the highest civic position in the city she called home. She wore it the same way she wore everything: as proof that you do not have to leave home to lead, and that the people who stay and invest are the ones who transform the place they love.

4

The Historic Campaign

When Federal Glover — the only person of color ever to serve on the Contra Costa Board of Supervisors after 24 remarkable years — announced his retirement, Shanelle entered the race to succeed him. She assembled a sweeping coalition of congressional, state, county, and labor endorsements, won the March 2024 primary in first place, and defeated Antioch Councilmember Mike Barbanica in November with 52.16% of the vote. Glover himself endorsed her the day before the election.

Career Timeline

From the daughter of a UA Local 342 union plumber to the first African American woman elected to the Contra Costa County Board of Supervisors — Shanelle Scales-Preston's journey spans more than two decades of unbroken public service, built entirely in and for the community she calls home.

Pittsburg HS
POSITION

Born and Raised on the Industrial Waterfront

Grows up in Pittsburg as the daughter of a UA Local 342 union plumber/small business owner and a glass-factory worker. Attends Pittsburg High School, developing the deep community roots that will anchor her entire career. Watches three neighborhood youth centers close — and files the memory away. Earns her degree from California State University, East Bay, staying close to home by choice, not circumstance.

2001
CAMPAIGN

Joins Congressman George Miller's Office

Begins a 23-year career in federal public service, starting as an intern in the office of Congressman George Miller. Learns the art of advocacy — fighting IRS battles, immigration tangles, and healthcare crises on behalf of constituents who have nowhere else to turn. Builds relationships across every city and community in Contra Costa County's political landscape, one constituent at a time.

Post-2014
POSITION

District Director — Rep. Mark DeSaulnier (CA-10)

After George Miller's retirement, becomes District Director for Congressman Mark DeSaulnier, managing constituent services across the full breadth of Contra Costa County. Works in every city and with every elected official and city manager in the district — building the relationships and reputation that will form the backbone of her 2024 supervisorial campaign. Simultaneously joins the boards of Pittsburg Police Activity League, Tri Delta Transit, TransPlan, MCE, and Los Medanos Healthcare Advisory.

2018
POSITION

Elected to Pittsburg City Council

Wins her first election to the Pittsburg City Council and immediately begins delivering. Champions the return of youth programs, fights for affordable housing, and pursues a holistic approach to public safety that combines fully-funded policing with youth prevention and mental health alternatives. Also elected President of the League of California Cities East Bay Division and Chair of TransPlan, cementing her regional leadership credentials alongside her city-level work.

June 2023
INNOVATION

Youth Center Reopens · Mayor of Pittsburg

The Pittsburg Youth Center — closed for years — reopens its doors under her leadership, joined by new summer jobs programs for youth and a 40,000 sq ft competition gymnasium. In the same year, her council colleagues elevate her to Mayor of Pittsburg. The 200-unit affordable housing project on formerly blighted land near BART is also complete. As she put it: "Pittsburg used to not have a good reputation, but if you come here now, it's awesome — we're thriving."

Mar 2024
CAMPAIGN

Wins District 5 Primary — First Place

Finishes first in the March 5, 2024 nonpartisan primary for Contra Costa County Board of Supervisors District 5, advancing to a November runoff against Antioch Councilmember Mike Barbanica. Endorsed by Congressmen DeSaulnier, George Miller, and Garamendi; AG Rob Bonta; State Treasurer Fiona Ma; Superintendent Tony Thurmond; former Supervisor Karen Mitchoff; Supervisor John Gioia; and the full Contra Costa labor coalition.

Nov 2024
RECOGNITION

Elected District 5 Supervisor — 52.16% of the Vote

Defeats Mike Barbanica with 41,317 votes (52.16%) to become the first African American woman elected to the Contra Costa County Board of Supervisors. The Mercury News editorial board endorsed her, citing her support for sheriff oversight and policy depth. Federal Glover — who served 24 years as the only person of color on the board — endorsed her the day before the election. Clerk-Recorder Kristin Braun Connelly certified the results on December 4, 2024.

Jan 14 2025
POSITION

Sworn In — History Made

Takes the oath of office as Contra Costa County District 5 Supervisor — the first African American woman ever elected to the board, and the second person of color in the board's history. District 5 includes Pittsburg, Bay Point, Martinez, Hercules, north Antioch, north Concord, Crockett, Rodeo, and more than a dozen unincorporated communities. Also joins the Delta Diablo Board of Directors, representing Bay Point. Her inauguration statement: "This moment is about building bridges — bridges to equity, community safety, economic opportunity, and a brighter future for all."

Stories of Impact

Two stories that define how Shanelle Scales-Preston operates — the personal fire that shapes her policy work, and the community transformation she delivered in her own backyard.

Shanelle Scales-Preston at the White Pony Express ribbon-cutting, Concord, August 2024 — Photo: Ray Saint Germain / Bay City News
Personal History

The Story That Made Her an Advocate

Shanelle speaks about her brother the way people speak about a truth they have had to carry for a long time. Growing up, he struggled with drug use and undiagnosed mental illness in a neighborhood where the line between survival and tragedy was thin. He spent over eleven years in prison. When he was released, the systems that should have wrapped around him — mental health treatment, transition support, community services — were absent.

In less than a year, in a moment of untreated mental health crisis, he took their father's life. Shanelle has never hidden this story. In the September 2024 CC Pulse interview, she said plainly: "I understand more services for mental health are still needed, and that's what the county is trying to help improve right now. Doing nothing or throwing people in jail doesn't help."

This is the fuel behind her co-championship of Contra Costa County's A3 (Anytime, Anywhere, Anyplace) crisis response program — which dispatches trained mental health therapists instead of police officers to mental health calls. In her hands, personal loss became structural change. It is the most honest thing she brings to public office.

Impact & Legacy

The A3 program has expanded to provide 24/7 crisis response across Contra Costa County, diverting mental health calls away from law enforcement and toward therapeutic intervention — changing outcomes for individuals who look just like her brother, and just like the man she lost.

Shanelle Scales-Preston — campaign portrait, 2024, photo via shanelle4supervisor.org
2018 – 2024

Bringing Pittsburg Back to Life

When Shanelle ran for Pittsburg City Council in 2018, one of her defining promises was to bring back the youth center. It sounds simple. It was not. For years the city had cut youth programming — all three of the centers she grew up with had disappeared. "One of the reasons I decided to run for Pittsburg City Council," she said, "was because all of our youth initiatives got shut down."

Over six years on the Council she delivered: the Pittsburg Youth Center reopened in June 2023, accompanied by a new summer jobs program so young people could earn money while figuring out what they wanted to do with their lives. She delivered 200 units of affordable housing on formerly blighted land within walking distance of BART, built in partnership with a nonprofit developer. She approved a 40,000 sq ft competition gymnasium — so families could stop driving hours to tournaments. She facilitated the city's first new hotel in years, a Courtyard by Marriott, ending the embarrassing situation of visitors having to stay in neighboring cities. She fully funded the police department at every budget cycle while also building relationships between officers and youth through East Bay Regional Park District hiking programs.

The transformation was real and measurable. As she told the Mercury News: "I've been able to work with local electeds each and every day... I have built a lot of relationships over the last 22 years because they have seen me working out in their communities."

Impact & Legacy

Pittsburg today is a demonstrably different city than the one Shanelle inherited. Her model — affordable housing near transit, youth centers, summer employment, community policing, economic development — is the exact playbook she now brings to the entire District 5 as County Supervisor.

Major Achievements

Six areas where Shanelle Scales-Preston has converted public service into measurable, lasting change — from housing to clean energy, from youth centers to making history.

🏛️

First Black Woman Elected to the CC Board

On January 14, 2025, Shanelle became the first African American woman ever elected to the Contra Costa County Board of Supervisors — and only the second person of color in the board's history. She succeeded Federal Glover, who had served 24 years as the sole person of color on the board, ensuring that District 5's diverse communities — Pittsburg, Bay Point, Martinez, Hercules, and more — retained authentic, lived-experience representation at the county level.

🏠

200 Units of Affordable Housing

Delivered 200 units of affordable housing on formerly blighted land within walking distance of BART in Pittsburg — completed in partnership with a nonprofit developer, creating a walkable, transit-connected community in East Contra Costa. Also worked to house unhoused veterans through dedicated partnerships. Her philosophy on housing: "Everyone can't afford a one-bedroom apartment for $2,100 per month." She brought that philosophy into policy and results.

🏀

Youth Champion: Reopened the Center

When all three of Pittsburg's youth centers had closed, Shanelle made reopening one a defining mission of her City Council tenure. The Pittsburg Youth Center reopened in June 2023 — accompanied by summer jobs programs for young people and a new 40,000 sq ft competition gymnasium. She also served on the Pittsburg Police Activity League, put police and youth on hikes together with East Bay Regional Park District, and championed youth programming as the most effective long-term public safety investment a community can make.

🧠

Mental Health Co-Response Pioneer

Co-championed Contra Costa County's A3 (Anytime, Anywhere, Anyplace) crisis response program — sending trained mental health therapists instead of police to mental health calls, available 24/7. Driven directly by her own family's experience with the devastating consequences of untreated mental illness and an inadequate support system, she turned personal grief into county-wide policy. The program is now a model for how local governments can reduce both harm and unnecessary incarceration through therapeutic intervention.

Clean Energy & Regional Leadership

Serves as Chair of the Marin Clean Energy (MCE) Board, driving equitable clean energy access for low-income communities across the region. Also led TransPlan as Chair, coordinating East County transportation services, and served as President of the League of California Cities East Bay Division. These three regional leadership roles — held simultaneously while serving on the City Council — gave her the breadth of relationships and institutional knowledge that most Supervisors spend their first term trying to build.

🤝

The Coalition That Won

Assembled one of the most powerful endorsement coalitions in recent East County history for her 2024 supervisorial campaign — three sitting U.S. Congressmen (DeSaulnier, Miller, Garamendi), AG Rob Bonta, State Treasurer Fiona Ma, Superintendent Tony Thurmond, former Supervisor Karen Mitchoff, Supervisors John Gioia and Diane Burgis, retiring Supervisor Federal Glover, and the full weight of the Contra Costa labor movement including the Central Labor Council, California Nurses Association, Teamsters 856 and 315, Nor Cal Carpenters, and SEIU-UHW. The Mercury News editorial board endorsed her, citing her policy depth and support for sheriff oversight.

Endorsed By

Congressman Mark DeSaulnier Congressman George Miller (Ret.) Congressman John Garamendi AG Rob Bonta State Treasurer Fiona Ma Supt. Tony Thurmond Federal Glover Karen Mitchoff John Gioia · Diane Burgis Nancy Parent Contra Costa Labor Council AFL-CIO California Nurses Association Teamsters 856 & 315 Sierra Club Mercury News Editorial Board

Legacy & Ripple Effects

Shanelle Scales-Preston's election is not just a historic first — it is the culmination of an architecture of service built deliberately over more than two decades, and the beginning of what she will build from the District 5 seat.

🏛️

The HerStory Lineage

Her election carries forward the work of Karen Mitchoff, Sunne Wright McPeak, and the network of women who built Contra Costa's progressive political infrastructure over decades. Mitchoff publicly endorsed her campaign, cementing this generational handoff. She is, in the truest sense, a daughter of this movement.

🌱

Proof That Staying Matters

In a political culture that often rewards those who leave for larger stages, Shanelle Scales-Preston chose to stay in Pittsburg — the city that made her — and serve it at every level. Her story is a living argument for rooted, community-grounded leadership, and proof that the path to power does not require leaving home.

🧠

Mental Health Policy Leadership

Her co-championship of the A3 program has placed Contra Costa County at the forefront of mental health crisis response in California. By speaking publicly and vulnerably about her family's experience, she has normalized the conversation around mental illness, incarceration, and the failures of purely punitive systems — changing how the county talks about public safety.

🏀

A Generation of Pittsburg Youth

The youth center she reopened, the summer jobs she created, the gym she built, the housing she delivered near BART — these are not abstractions. They are the backdrop against which a new generation of Pittsburg young people will grow up. Some of them will go into public service. Some of them will run for office. And they will have Shanelle's example as evidence that it is possible.

Clean Energy Equity

As Chair of MCE's Board, Shanelle ensured that clean energy access was not limited to wealthier communities — fighting for equitable implementation for low-income households across the region. Her work at the intersection of environmental policy and economic justice continues from the Supervisors' seat, where District 5's industrial waterfront communities need both clean energy investment and real economic opportunity.

🌉

The Bridge She Is Building

For the unincorporated communities of Bay Point, for the residents of Pittsburg who watched their youth centers disappear and watched her bring one back, for the families who needed mental health services instead of handcuffs — Shanelle Scales-Preston's bridge is already under construction. She is not waiting for permission to build it. She never has.

This moment is about building bridges — bridges to equity, community safety, economic opportunity, and a brighter future for all. Together, we will strive to ensure that every voice is heard, every neighborhood thrives, and every family has the opportunity to succeed.

— Shanelle Scales-Preston, Inauguration as District 5 Supervisor, January 14, 2025