Cook County Government Executive and Leadership Team

August, 2026

Leadership Overview

Cook County Government has 10 executives leading key functions including strategy, operations, administration, technology, and finance.

Committed to delivering essential public services to millions of residents, Cook County Government maintains a robust framework for healthcare, public safety, and administrative excellence across the region.

Leadership Roles at Cook County Government

  • Chief Executive Officer - Jeannie Aguilar
  • Chief Financial Officer - Raymond Balcarcel
  • Deputy Chief Financial Officer - Dean Constantinou
  • Chief Operating Officer - Kapil Namdev
  • Chief of Staff - T'challa Ross
  • Chief Information Officer - Darren Ganir
  • Chief Technology Officer - Kathleen Lynch
  • Deputy Chief of Staff, Policy - Rachel Ruttenberg
  • Chief of Staff & County Cook & Junior Michael Scott Commissioner - Breana Braden
  • Chief of Staff & County Cook & Bridget Gainer Commissioner - Hannah Fierle
  • Jeannie Aguilar - Chief Executive Officer

    Jeannie Aguilar, the Chief Executive Officer at Cook County Government, directs the overarching strategic vision for the organization. Aguilar manages the alignment of diverse departments to ensure the efficient delivery of public services across the county. By coordinating with the Board of Commissioners, the Chief Executive Officer establishes policy priorities that address the needs of the most populous county in Illinois. Aguilar monitors the performance of healthcare, legal, and public safety sectors to maintain high standards of governance. This leadership role involves balancing fiscal responsibility with the mandate to provide accessible resources to all residents. Through rigorous oversight of administrative functions, Jeannie Aguilar drives the long-term mission of the government. The Chief Executive Officer fosters collaboration between agencies to optimize service delivery and improve public outcomes throughout the region.

    Raymond Balcarcel - Chief Financial Officer

    Raymond Balcarcel, the Chief Financial Officer at Cook County Government, manages the fiscal health and budgetary planning for the entire organization. Balcarcel oversees tax collection, revenue management, and the allocation of funds to essential public services. By monitoring financial performance, the Chief Financial Officer ensures that the government maintains a balanced budget while funding critical healthcare and legal programs. Balcarcel provides the Board of Commissioners with detailed financial analysis to support informed decision-making. This role involves rigorous auditing and compliance oversight to ensure the responsible use of public resources. Raymond Balcarcel drives the financial strategy that supports the long-term stability of the county. The Chief Financial Officer maintains transparency in all fiscal matters, ensuring that the government remains accountable to the taxpayers while funding the infrastructure and services necessary for the community.

    Dean Constantinou - Deputy Chief Financial Officer

    Dean Constantinou, the Deputy Chief Financial Officer at Cook County Government, supports the financial operations by managing specific budgetary departments and revenue streams. Constantinou oversees the day-to-day accounting processes and ensures that departmental spending remains within established limits. By assisting the Chief Financial Officer, the Deputy Chief Financial Officer helps maintain the integrity of the county's financial records. Constantinou monitors cash flow and prepares detailed reports for the executive team to track fiscal progress. This role involves identifying opportunities for cost savings and operational efficiency within the financial department. Dean Constantinou drives the accuracy of financial reporting, ensuring that all data is compliant with government standards. The Deputy Chief Financial Officer plays a vital role in maintaining the fiscal health of the organization, providing the necessary support to keep public services funded and operational.

    Kapil Namdev - Chief Operating Officer

    Kapil Namdev, the Chief Operating Officer at Cook County Government, manages the daily operational workflows across all county departments. Namdev oversees the implementation of policies that govern public safety, property assessment, and tax collection. By streamlining internal processes, the Chief Operating Officer ensures that facilities operate at peak efficiency to meet the demands of a large, diverse population. Namdev coordinates with department heads to resolve logistical challenges and improve the quality of public service delivery. This role requires constant monitoring of resource allocation to support the expansive infrastructure of the county. Kapil Namdev maintains operational continuity by enforcing strict performance metrics and accountability standards. The Chief Operating Officer drives organizational excellence by refining the systems that support the essential functions of the government, ensuring that every department remains responsive to the needs of the residents.

    T'challa Ross - Chief of Staff

    T'challa Ross, the Chief of Staff at Cook County Government, coordinates the executive office activities and facilitates communication between leadership and the Board of Commissioners. Ross manages the flow of information and policy initiatives to ensure that the strategic goals of the government remain on track. By organizing high-level meetings and managing internal projects, the Chief of Staff supports the decision-making process for the entire organization. Ross bridges the gap between various departments to foster a unified approach to public service. This leadership position requires managing complex schedules and prioritizing urgent matters that impact the county. T'challa Ross drives the execution of administrative directives while maintaining transparency in government operations. The Chief of Staff ensures that the executive team remains focused on the core mission of providing essential services to the public, effectively managing the internal dynamics of the organization.

    Darren Ganir - Chief Information Officer

    Darren Ganir, the Chief Information Officer at Cook County Government, architects the digital infrastructure necessary for modernizing public service delivery. Ganir oversees the management of data systems, cybersecurity protocols, and information technology assets across all county offices. By implementing scalable software solutions, the Chief Information Officer improves the accessibility of public records and administrative services for residents. Ganir collaborates with other C-suite leaders to integrate technology into healthcare and legal operations, enhancing overall efficiency. This role involves protecting sensitive information while ensuring that digital platforms remain reliable and user-friendly. Darren Ganir drives the digital transformation of the government to meet the evolving needs of the population. The Chief Information Officer maintains the integrity of the county's information systems, ensuring that all departments have the tools required to perform their duties effectively in a digital-first environment.
    Darren Ganir

    Kathleen Lynch - Chief Technology Officer

    Kathleen Lynch, the Chief Technology Officer at Cook County Government, directs the research and development of emerging technologies to support county operations. Lynch focuses on the integration of advanced hardware and network solutions that underpin the government's public safety and administrative facilities. By evaluating new technical frameworks, the Chief Technology Officer ensures that the organization remains at the forefront of innovation. Lynch works closely with the IT department to upgrade legacy systems and improve the speed of service delivery. This leadership role involves managing the technical roadmap to support long-term growth and operational stability. Kathleen Lynch drives the adoption of modern tools that enhance the functionality of courts and healthcare facilities. The Chief Technology Officer ensures that the technological foundation of the county is robust, secure, and capable of supporting the diverse requirements of the public sector.
    Kathleen Lynch

    Rachel Ruttenberg - Deputy Chief of Staff, Policy

    Rachel Ruttenberg, the Deputy Chief of Staff, Policy at Cook County Government, develops and implements policy frameworks that guide the organization's public service initiatives. Ruttenberg analyzes legislative trends and community needs to draft effective strategies for healthcare and public safety. By coordinating with various departments, the Deputy Chief of Staff, Policy ensures that all programs align with the government's mission and legal requirements. Ruttenberg facilitates discussions between stakeholders to build consensus on complex policy issues. This role involves researching best practices to improve the quality of life for county residents. Rachel Ruttenberg drives the policy agenda that shapes the future of the government's service offerings. The Deputy Chief of Staff, Policy maintains a focus on equity and efficiency, ensuring that every policy decision contributes to the overall well-being of the population served by the county.

    Breana Braden - Chief of Staff & County Cook & Junior Michael Scott Commissioner

    Breana Braden, the Chief of Staff & County Cook & Junior Michael Scott Commissioner at Cook County Government, manages the administrative and legislative priorities for the commissioner's office. Braden coordinates the activities of the office to ensure that constituent concerns are addressed and policy goals are met. By facilitating communication between the commissioner and other government departments, the Chief of Staff & County Cook & Junior Michael Scott Commissioner ensures that the office remains effective in its advocacy. Braden oversees the scheduling and project management for the commissioner's team. This role involves navigating the complexities of local government to advance the interests of the district. Breana Braden drives the legislative agenda and ensures that the office remains responsive to the needs of the public. The Chief of Staff & County Cook & Junior Michael Scott Commissioner maintains the operational efficiency of the office, supporting the broader mission of the government.

    Hannah Fierle - Chief of Staff & County Cook & Bridget Gainer Commissioner

    Hannah Fierle, the Chief of Staff & County Cook & Bridget Gainer Commissioner at Cook County Government, directs the strategic operations for the commissioner's office. Fierle manages the legislative research and community outreach efforts that define the office's impact on the county. By coordinating with internal and external stakeholders, the Chief of Staff & County Cook & Bridget Gainer Commissioner ensures that the commissioner's initiatives receive the necessary support. Fierle oversees the administrative staff and manages the flow of policy documents to the Board of Commissioners. This role requires a deep understanding of local government processes and a commitment to public service. Hannah Fierle drives the implementation of programs that address the specific needs of the district. The Chief of Staff & County Cook & Bridget Gainer Commissioner maintains the high standards of the office, ensuring that all activities align with the government's overall mission.

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    Frequently Asked Questions Regarding Cook County Government Top Executives and Leadership Team

    Who leads Cook County Government?
    Cook County Government is led by Jeannie Aguilar (Chief Executive Officer), along with executives such as Raymond Balcarcel (Chief Financial Officer) and Dean Constantinou (Deputy Chief Financial Officer).
    Who is part of Cook County Government’s executive team?
    The executive team of Cook County Government includes leaders such as Jeannie Aguilar (Chief Executive Officer), Raymond Balcarcel (Chief Financial Officer), Dean Constantinou (Deputy Chief Financial Officer) and other senior executives.
    How many executives does Cook County Government have?
    Cook County Government has 10 executives leading key business areas.
    What roles are included in Cook County Government’s leadership team?
    The leadership team of Cook County Government includes roles such as Chief Executive Officer, Chief Financial Officer, Deputy Chief Financial Officer, Chief Operating Officer, Chief of Staff.