About the County Administrative Office

The County Administrative Office is privileged to serve a dynamic organization of dedicated leaders and county staff under the policy direction of the Board of Supervisors. The Chief Executive Officer, along with the Executive Team, work in collaboration with County departments, cities and school leaders, state and federal legislators and agencies, and all community stakeholders to make the County a better place to live, work, and play. The Office makes it a priority to develop a culture of excellence within the County organization to ensure county residents and investors receive the highest level of service from their County Government.

Senior Executive Team

Luther Snoke

Chief Executive Officer

Luther Snoke_CAO

Luther Snoke was appointed as San Bernardino County’s Chief Executive Officer on September 12, 2023. Prior to that he served as the Chief Operating Officer since October 2020. 

Luther believes County employees are Hungry, Humble, and Hustle every day. They are driven to make the lives of San Bernardino County’s residents better through dedication, teamwork, and innovation. He is a strong supporter of using data to guide decisions, fostering trust and accountability, and ensuring strategic alignment across the organization. He is also deeply committed to initiatives that help employees feel valued, empowered, and supported in their work.

As the County Chief Operating Officer, Luther worked closely with County executive leadership and Department Heads to advance the Countywide Vision and deliver vital services to San Bernardino County residents.  Throughout his County career, Luther has been instrumental in multiple projects including the long-needed completion of a new Lake Gregory Dam, the building of a new Big Bear Alpine Zoo, and construction of a new water system for Pioneertown.

Luther began his career with San Bernardino County in 2013 and has served as County Chief Operating Officer, Deputy Executive Officer, Strategic Initiatives Chief, and Administrative Analyst III. In each role he has effectively managed operations and partnerships to deliver results for San Bernardino County residents.  Prior to joining the County, Luther held multiple corporate leadership positions, including Vice President of Finance for a publicly traded healthcare organization.  Luther received his Business Administration degree from California State University, Fullerton, and is a CSAC Credentialed Senior Executive.

Matthew Erickson

Chief Management Officer

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Matthew Erickson serves as Chief Management Officer for San Bernardino County, providing executive leadership and oversight of the County’s administrative and internal service departments that support operations across the organization. In this role, he is focused on strengthening organizational performance, improving administrative services, and ensuring County departments and employees have the tools and support needed to effectively serve residents.

Matthew has 21 years of County service, all within the County Administrative Office, and previously served eight years as the County’s Chief Financial Officer. Throughout his career, he has played a central role in guiding the County’s financial management and long-term fiscal strategy, while also providing executive oversight to a broad range of administrative functions, including Human Resources, Labor Relations, Purchasing, Risk Management, Legislative Affairs and Government Relations, and the Innovation and Technology Department.

A lifelong San Bernardino County resident, Matthew grew up in Ontario and lives in Rancho Cucamonga. He is passionate about responsible stewardship, continuous improvement, and finding practical ways to make employees’ work more effective and efficient so they can better serve the residents of San Bernardino County.

Diane Rundles

Chief Operating Officer

Diane brings more than two decades of government leadership experience, eight of which have been spent across many of San Bernardino County’s most complex service areas, including health and human services, housing and homelessness, child welfare, human resources, risk management, labor relations, training, and organizational transformation. Her career has focused on advancing housing and homelessness initiatives, strengthening care coordination, expanding services for foster youth, and driving meaningful organizational improvements across County agencies.

As Chief Operating Officer, Diane serves as a key integrator of the CEO’s and Board’s priorities, ensuring alignment across community-facing departments, supporting strong and effective leadership, and delivering measurable outcomes for County residents. Born and raised in the Inland Empire, Diane possesses a strong commitment to strengthening government service, nimble problem‑solving, and a passion for public service in San Bernardino County.

Trevor Leja

Assistant Executive Officer

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Trevor Leja became an Assistant Executive Officer in September 2023. Trevor works closely with the County Executive Officer, County Executive Leadership and Department Heads to support the daily department operations of the County Communications Group, ICEMA, and Office of Emergency Services. Trevor also serves as Department Liaison to the Sheriff/Coroner/Public Administrator, District Attorney, Arrowhead Regional Medical Center, County Fire District, Probation, and the Public Defender.

Chad Nottingham

Assistant Executive Officer

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Chad Nottingham began his career with San Bernardino County in 2000 and currently serves as Assistant Executive Officer. In this role, he works closely with the Chief Executive Officer, County Executive leadership, and department heads to advance strategic priorities and uphold the Countywide Vision.

Prior to his current role, Chad served as Deputy Executive Officer. With more than 25 years of public service with the County, he provides executive oversight of Airports, Economic Development, Land Use Services, Public Health, and Workforce Development.

Gilbert Ramos

Assistant Executive Officer

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With over 32 years of service to the County, Gilbert has held numerous leadership roles, including Director of the Transitional Assistance Department (TAD). Since Gilbert’s promotion to Deputy Executive Officer in February of 2024, he has continued to demonstrate strong leadership and a commitment to supporting departments in achieving their vision and goals. As an Assistant Executive Officer, Gilbert provides oversight to Aging and Adult Services-Public Guardian, Behavioral Health, Children & Family Services, Child Support Services, First 5, In-Home Supportive Services Public Authority, Preschool Services, Transitional Assistance, and Veterans Affairs.

Michael Vu

Assistant Executive Officer

Michael is an accomplished executive with over 28 years of experience, most recently as the Assistant Chief Administrative Officer with San Diego County. Michael has extensive experience with governmental budget, Registrar of Voters operations, and policy implementation. Michael’s leadership style focuses on collaboration, ethics, and extensive communication.  As an Assistant Executive Officer, Michael oversees the departments of Agriculture/Weights & Measures, County Library, County Museum, Public Works, Regional Parks, and Registrar of Voters.

Executive Team

Derek Armstrong

Deputy Executive Officer

Derek Armstrong

Derek Armstrong has been a dedicated employee of San Bernardino County since June 2022. As Deputy Executive Officer, he oversees the Community Development & Housing Department and Office of Homeless Services. With over 12 years of experience in various government organizations and five years of service in the United States Marine Corps, Derek brings a wealth of knowledge and dedication to his position. He holds a Juris Doctor and a Bachelor’s Degree in Economics, and is passionate about public service, committed to creating opportunities for residents and their families to achieve upward social mobility and a higher quality of life.

Diana Atkeson

Chief Financial Officer

Diana Atkeson has served San Bernardino County since 1996 and brings 30 years of County experience across Human Services, accounting, administration, and finance to her role as County Chief Financial Officer (CFO).

As CFO, Diana oversees Finance and Administration and provides executive leadership over the County’s financial strategy and stewardship, including development and oversight of the County’s annual budget and five-year financial forecast, debt and capital financing, fiscal policy, and other major financial initiatives.

Prior to her appointment as CFO, Diana served as Assistant County CFO, Deputy Executive Officer in CAO-Finance, and Assistant Auditor-Controller/Treasurer/Tax Collector. Throughout her career, she has led and supported complex countywide fiscal, operational, and modernization efforts.

Having grown up in San Bernardino, Diana brings a strong personal connection to the community and is committed to sound fiscal stewardship, collaborative leadership, and supporting effective service delivery for County residents.

Valerie Clay

Deputy Executive Officer

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Valerie is the Deputy Executive Officer responsible for Countywide Fee and Rate Administration. Additionally, Valerie helps oversee the financial operations of the Sheriff’s Department, Probation Department, Public Defender, District Attorney, Arrowhead Regional Medical Center, San Bernardino County Fire Protection District, Agriculture/Weights and Measures, Airports, County Library, County Museum, County Trial Courts, Regional Parks, Registrar of Voters, Fleet Management, Information and Technology Department, Risk Management, and Public Works including Special Districts.

Leia Fletes

Deputy Executive Officer- Director of Government Relations

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Leia Fletes is a seasoned professional in government relations, currently serving as the Director of Government Relations for San Bernardino County. With 17 years of experience, Leia specializes in strategic outreach, thoughtful diplomacy, and relationship building within intergovernmental and legislative environments. Throughout her career, Leia has demonstrated strong leadership and managerial skills, leading outreach efforts, coordinating policy forums, engaging stakeholders, and navigating complex political landscapes. She holds a Bachelor of Science degree in Organizational Leadership from Azusa Pacific University and an Associate of Arts degree from Rio Hondo College. Leia remains committed to ongoing professional development by actively participating in courses offered by various higher education and professional institutes, fostering continuous learning.

Martha Guzman-Hurtado

Chief Communications Officer

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Martha Guzman-Hurtado joined the San Bernardino County Administrative Office as Chief Communications Officer in September 2021. 

Her responsibilities include:

  • Overseeing the One County. One Voice centralized communications approach to enhance countywide departmental collaboration. 
  • Developing clear, engaging, and targeted communications and marketing strategies to continue to elevate the County’s messaging and brand.
  • Leading a team of communication professionals to execute long-term communications goals and priorities.
  • Working collaboratively with departments to ensure all communications are consistent with the San Bernardino County brand and align with strategic goals.

Martha’s previous roles include Communications and Legislative Affairs Manager for the City of El Segundo, Communications and Marketing Manager for the City of Fontana, Public Information Coordinator for the Fontana Police Department, and Public Information Coordinator for the City of Yuma, Arizona. Martha earned a Master of Business Administration from Walden University and also holds dual Bachelor of Arts degrees in Broadcast Journalism and Political Science from the University of Southern California in Los Angeles. She worked as a broadcast news reporter at television stations throughout the country including Fresno, California; Raleigh-Durham, North Carolina; and Las Vegas, Nevada before transitioning to the public sector.

Paloma Hernandez-Barker

Deputy Executive Officer

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Paloma is the Deputy Executive Officer primarily responsible for the administration and oversight of the countywide budget process. Additionally, Paloma helps oversee the financial operations of the Assessor/Recorder/County Clerk (ASR), Auditor-Controller/Treasurer/Tax Collector (ATC), County Administrative Office (CAO), CAO Finance and Administration, County Communications, Economic Development, Human Resources, Project and Facilities Management, Purchasing, Real Estate Services, and Workforce Development.

Michael Jimenez

Deputy Executive Officer

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Michael Jimenez currently serves as Deputy Executive Officer at the County Administrative Office of San Bernardino County. As DEO, Michael provides oversight and support to the departments of Airports, Economic Development, Fleet Management, Land Use Services, Real Estate Services and Workforce Development.

Robert Saldana

Deputy Executive Officer

Robert is the Deputy Executive Officer responsible for the financial operations of Human Services Finance.  Additionally, Robert oversees the County’s debt portfolio as well as the financial operations of the Human Services Group, Community Development and Housing, ICEMA, Office of Emergency Services and the Office of Homeless Services. 

Stephenie Shea

Deputy Executive Officer

Stephenie Shea is the Deputy Executive Officer responsible for Board Administration, Board Agenda Item review, and Special Projects.  Her role is to support the Chief Financial Officer and also assist with countywide initiatives.

Victor Tordesillas

Deputy Executive Officer

Victor Tordesillas is a Deputy Executive Officer with the County Administrative Office. As DEO, Victor works closely with the County executive leadership team and Department Heads to support the daily department administration and operations for Behavioral Health, Public Health and the Performance, Education, and Resource Centers.

Moe Yousif

Deputy Executive Officer

Moe Yousif is a Deputy Executive Officer with the County Administrative Office.  Moe works closely with County Assistant Executive Officers, as well as County Executive Leadership and Department Heads to support the daily operations and projects of the Public Works, Projects and Facilities Management, Regional Parks, Airports, Agriculture/Weight & Measures and ICEMA Departments.