Cook County Government Executive and Leadership Team

July, 2026

Leadership Overview

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

Driven by a commitment to public service, Cook County Government provides essential services like healthcare, legal aid, and public safety, implementing policies to serve its residents across Illinois.

Leadership Roles at Cook County Government

  • Chief Executive Officer - Jeannie Aguilar
  • Chief Financial Officer - Tanya Anthony
  • Deputy Chief Financial Officer - Dean Constantinou
  • Chief Operating Officer - Kapil Namdev
  • Chief of Staff - Jamila McMillon
  • Chief Technology Officer - Kathleen Lynch
  • Chief of Staff & County Cook & Junior Michael Scott Commissioner - Breana Braden
  • Deputy Chief of Staff - Daniel Korso
  • Chief of Staff & Office of County Cook & Scott Britton Commissioner - Julie Kaviar
  • 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 strategy and operational framework for the county. Aguilar's leadership guides the provision of essential public services, including healthcare, legal services, public safety, property assessment, and tax collection. This executive role involves ensuring the efficient allocation of public resources and the effective implementation of policies designed to benefit county residents. Aguilar collaborates with the Board of Commissioners to set strategic priorities and oversees the various departments responsible for executing the county's mission. The focus remains on enhancing service delivery and maintaining the integrity of governmental operations across the most populous county in Illinois.

    Tanya Anthony - Chief Financial Officer

    Tanya Anthony, the Chief Financial Officer at Cook County Government, directs all financial planning, budgeting, and fiscal management activities. Anthony oversees the collection and disbursement of county funds, ensuring fiscal responsibility and compliance with state and federal regulations. This executive role involves managing the county's financial health, including property assessment, tax collection, and the allocation of resources to essential public services like healthcare and public safety. The Chief Financial Officer works closely with department heads to develop budgets that support operational needs and strategic goals. Tanya Anthony's leadership ensures the financial stability and integrity of Cook County Government's operations.

    Dean Constantinou - Deputy Chief Financial Officer

    Dean Constantinou, the Deputy Chief Financial Officer at Cook County Government, assists the Chief Financial Officer in managing the county's fiscal operations. Constantinou supports financial planning, budgeting, and oversight of tax collection and property assessment processes. This role involves ensuring the efficient allocation of resources for public services, including healthcare and public safety, and maintaining compliance with financial regulations. The Deputy Chief Financial Officer plays a crucial part in supporting the financial stability and integrity of the county's operations. Dean Constantinou's work contributes to the sound fiscal management of Cook County Government.

    Kapil Namdev - Chief Operating Officer

    Kapil Namdev, the Chief Operating Officer at Cook County Government, manages the day-to-day administrative and operational functions across all county departments. Namdev oversees the execution of strategic initiatives, ensuring that public services such as healthcare, legal services, and public safety are delivered efficiently and effectively. This role involves optimizing internal processes, managing inter-departmental coordination, and ensuring compliance with established policies and regulations. The Chief Operating Officer plays a critical part in resource management, driving operational improvements, and maintaining the functionality of the county's extensive network of facilities and administrative offices. Namdev's leadership ensures the smooth operation of government services for the residents of Cook County.

    Jamila McMillon - Chief of Staff

    Jamila McMillon, the Chief of Staff at Cook County Government, provides strategic support and manages key initiatives for the executive leadership. McMillon coordinates efforts across various departments to ensure alignment with the county's mission of public service, focusing on areas like healthcare, legal services, and public safety. This position involves facilitating communication between the Board of Commissioners and operational teams, streamlining administrative processes, and overseeing special projects. The Chief of Staff ensures that the executive agenda is effectively translated into actionable plans, driving progress on policy implementation and service delivery improvements. Jamila McMillon's role is central to the efficient functioning of the county's administrative operations.

    Kathleen Lynch - Chief Technology Officer

    Kathleen Lynch, the Chief Technology Officer at Cook County Government, leads the strategic direction and implementation of technology initiatives across the county. Lynch oversees the development and maintenance of IT infrastructure, ensuring robust systems for public services including healthcare, legal services, and public safety. This role involves managing data security, implementing innovative technological solutions, and supporting digital transformation efforts to enhance service delivery and operational efficiency. The Chief Technology Officer ensures that technology investments align with the county's mission and support its administrative and public-facing functions. Kathleen Lynch's expertise drives technological advancement within Cook County Government.
    Kathleen Lynch

    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 critical administrative functions and supports the Board of Commissioners. Braden's responsibilities include coordinating policy implementation, facilitating communication between departments, and overseeing specific operational projects that enhance public services such as healthcare and public safety. This dual role involves ensuring the effective execution of the county's strategic objectives and supporting the legislative agenda of the Commissioner. Breana Braden contributes to the efficient governance and service delivery framework of Cook County.

    Daniel Korso - Deputy Chief of Staff

    Daniel Korso, the Deputy Chief of Staff at Cook County Government, supports the Chief of Staff in managing administrative operations and strategic initiatives. Korso assists in coordinating departmental efforts, ensuring the smooth delivery of public services including healthcare, legal services, and public safety. This role involves facilitating communication, overseeing project timelines, and ensuring adherence to county policies. The Deputy Chief of Staff plays a key part in the operational efficiency of the executive office, contributing to the effective implementation of the county's mission. Daniel Korso's work supports the overall governance and service provision for Cook County residents.

    Julie Kaviar - Chief of Staff & Office of County Cook & Scott Britton Commissioner

    Julie Kaviar, the Chief of Staff & Office of County Cook & Scott Britton Commissioner at Cook County Government, oversees key administrative functions and supports the Commissioner's office. Kaviar manages strategic projects and ensures effective coordination across departments to deliver essential public services, including healthcare and public safety. This position involves facilitating communication, streamlining operational processes, and supporting the implementation of county policies. The Chief of Staff role ensures that the Commissioner's objectives are met and that the office contributes effectively to the county's governance. Julie Kaviar's efforts enhance the operational capacity of the Cook County 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, manages critical administrative functions and supports the Commissioner's strategic agenda. Fierle coordinates departmental activities to ensure the effective delivery of public services, such as healthcare and public safety, and oversees specific initiatives. This role involves enhancing inter-departmental communication and ensuring compliance with county policies and operational standards. The Chief of Staff position is vital for the efficient functioning of the Commissioner's office and the overall execution of county governance. Hannah Fierle's contributions support the mission of Cook County Government.

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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 Tanya Anthony (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), Tanya Anthony (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.