County of Ventura Executive and Leadership Team

September, 2026

Leadership Overview

County of Ventura has 5 executives leading key functions including operations, administration, technology, and executive management.

Committed to public service excellence, County of Ventura delivers essential healthcare, transportation, and administrative support to residents across southern California through a robust network of regional facilities and community programs.

Leadership Roles at County of Ventura

  • Owner and President - Debra Thomas
  • Chief of Staff - Brian Miller
  • Chief Information Officer - Terry Theobald
  • Chief Information Officer, Assisitant - Pat Patterson
  • Deputy Director - Sergio Vargas
  • Debra Thomas - Owner and President

    Debra Thomas, the Owner and President at County of Ventura, provides high-level strategic vision for the governance and administration of the county. Thomas directs the overarching mission of the organization, ensuring that all public services align with the needs of the southern California community. By overseeing the financial health and legal administration of the county, the Owner and President maintains the integrity of government operations. Debra Thomas collaborates with the executive team to set long-term goals for healthcare, transportation, and community development. This leadership role involves representing the county in regional forums and managing relationships with external stakeholders. Through the promotion of transparent governance, the Owner and President drives public trust and organizational accountability. Thomas evaluates the performance of key departments to ensure that resources support the most critical community programs. Ultimately, the Owner and President secures the long-term sustainability of the county, fostering an environment where public services thrive and residents receive high-quality support.

    Brian Miller - Chief of Staff

    Brian Miller, the Chief of Staff at County of Ventura, coordinates strategic planning and executive communication across the entire government organization. Miller manages the flow of information between the leadership team and various departments, ensuring that policy directives receive proper execution. By facilitating high-level meetings, the Chief of Staff aligns administrative priorities with the long-term goals of the county. Brian Miller oversees the development of internal policies that govern human resources and financial services, maintaining organizational stability. This role involves managing complex stakeholder relationships and resolving operational bottlenecks that impede progress. Through careful analysis of government mandates, the Chief of Staff provides actionable insights to the executive team. Miller drives the implementation of cross-functional projects, ensuring that all departments work in harmony to support the local population. Ultimately, the Chief of Staff secures the effectiveness of the executive office by streamlining decision-making processes and maintaining a focus on public service excellence.

    Terry Theobald - Chief Information Officer

    Terry Theobald, the Chief Information Officer at County of Ventura, architects the digital infrastructure necessary for modern government service delivery. Theobald directs the deployment of secure information technology systems that support healthcare clinics, financial services, and legal administration. By overseeing the modernization of data management platforms, the Chief Information Officer ensures that residents access essential services with maximum efficiency. Terry Theobald manages the cybersecurity posture of the county, protecting sensitive public records from emerging digital threats. This leadership role involves collaborating with other C-suite executives to integrate technology into every facet of government operations. Through the implementation of scalable cloud solutions, the Chief Information Officer drives digital transformation across the region. Theobald monitors system performance to guarantee uptime for critical public programs. Ultimately, the Chief Information Officer secures the technological foundation of the organization, enabling seamless communication and data-driven decision-making for all departments within the county.
    Terry Theobald

    Pat Patterson - Chief Information Officer, Assisitant

    Pat Patterson, the Chief Information Officer, Assisitant at County of Ventura, supports the expansion of digital capabilities across the government enterprise. Patterson manages the technical support teams responsible for maintaining hardware and software assets in regional health centers and administrative offices. By overseeing the daily maintenance of network infrastructure, the Chief Information Officer, Assisitant ensures that staff members possess the tools required for effective public service. Pat Patterson coordinates with the Chief Information Officer to implement software upgrades that improve data accessibility for residents. This role involves managing vendor relationships and procurement processes for all technology-related equipment. Through rigorous testing of new applications, the Chief Information Officer, Assisitant drives the adoption of user-friendly interfaces for community programs. Patterson monitors system logs to identify potential vulnerabilities, proactively addressing technical issues before service disruptions occur. Ultimately, the Chief Information Officer, Assisitant secures the reliability of the county's digital environment, facilitating consistent service delivery for the local population.
    Pat Patterson

    Sergio Vargas - Deputy Director

    Sergio Vargas, the Deputy Director at County of Ventura, manages complex operational workflows across multiple government departments. Vargas directs the implementation of public service initiatives, ensuring that healthcare clinics and transportation management systems meet strict regulatory standards. By coordinating with department heads, the Deputy Director optimizes resource allocation to improve service delivery for the local population. Sergio Vargas maintains oversight of administrative functions, driving efficiency in daily government operations. This leadership role requires constant collaboration with the Board to align departmental goals with the broader mission of the county. Through rigorous monitoring of service metrics, the Deputy Director identifies opportunities for process improvement. Vargas secures the operational integrity of the organization by enforcing compliance protocols and managing inter-departmental communication. Ultimately, the Deputy Director fosters a culture of accountability, ensuring that all public programs remain responsive to the evolving needs of the community throughout the southern California region.

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    Frequently Asked Questions Regarding County of Ventura Top Executives and Leadership Team

    Who leads County of Ventura?
    County of Ventura is led by Debra Thomas (Owner and President), along with executives such as Brian Miller (Chief of Staff) and Terry Theobald (Chief Information Officer).
    Who is part of County of Ventura’s executive team?
    The executive team of County of Ventura includes leaders such as Debra Thomas (Owner and President), Brian Miller (Chief of Staff), Terry Theobald (Chief Information Officer) and other senior executives.
    How many executives does County of Ventura have?
    County of Ventura has 5 executives leading key business areas.
    What roles are included in County of Ventura’s leadership team?
    The leadership team of County of Ventura includes roles such as Owner and President, Chief of Staff, Chief Information Officer, Chief Information Officer, Assisitant, Deputy Director.