Simpson Thacher Executive and Leadership Team

August, 2026

Leadership Overview

Simpson Thacher has 4 executives leading key functions including financial strategy, information technology, and human capital management.

Renowned for providing coordinated legal advice and transactional capability, Simpson Thacher maintains a commitment to excellence while delivering sophisticated legal solutions to clients across global markets.

Leadership Roles at Simpson Thacher

  • Chief Financial Officer - Adrienne Boán
  • Chief Information Officer - Willis Gee
  • Chief Human Resources Officer - Edina Jung
  • Chief Human Resources Officer - Eric Edelson
  • Adrienne Boán - Chief Financial Officer

    Adrienne Boán, the Chief Financial Officer at Simpson Thacher, directs the firm's global financial operations and fiscal planning. Managing the capital structure, the Chief Financial Officer ensures the firm maintains the necessary liquidity to support complex international legal transactions. Boán oversees the budgeting process, financial reporting, and tax compliance across all regional offices. By analyzing market trends, the Chief Financial Officer provides the executive committee with actionable data to optimize resource allocation. This leadership role involves mitigating financial risk while supporting the firm's long-term growth objectives. Through rigorous oversight of internal controls, Adrienne Boán secures the financial integrity of the organization. The Chief Financial Officer collaborates with department heads to align spending with the firm's strategic goals. Ultimately, Boán drives the financial stability required to sustain the firm's competitive position in the global legal services market.
    Adrienne Boán

    Willis Gee - Chief Information Officer

    Willis Gee, the Chief Information Officer at Simpson Thacher, architects the firm's digital infrastructure and cybersecurity framework. Overseeing the integration of advanced legal technology, the Chief Information Officer ensures that attorneys possess the tools required for efficient document management and secure client communication. Gee manages the firm's global network, protecting sensitive data against evolving digital threats. By implementing scalable cloud solutions, the Chief Information Officer supports the firm's ability to handle high-stakes transactional work across multiple jurisdictions. This leadership role involves coordinating with the IT department to modernize legacy systems and improve operational agility. Through the deployment of innovative software, Willis Gee enhances the firm's overall productivity. The Chief Information Officer maintains a focus on technological resilience, ensuring that the firm's digital assets remain protected and accessible. Ultimately, Gee drives the digital transformation necessary to maintain the firm's reputation for excellence.
    Willis Gee

    Edina Jung - Chief Human Resources Officer

    Edina Jung, the Chief Human Resources Officer at Simpson Thacher, directs the firm's talent acquisition and professional development initiatives. Focusing on the recruitment of top-tier legal talent, the Chief Human Resources Officer designs programs that foster a culture of excellence and inclusion. Jung manages performance evaluation systems, compensation structures, and employee engagement strategies across the firm's international footprint. By aligning human capital with the firm's business objectives, the Chief Human Resources Officer ensures that the organization attracts and retains the best legal minds. This leadership role involves navigating complex labor regulations and promoting professional growth for all staff members. Through the implementation of comprehensive training modules, Edina Jung strengthens the firm's internal capabilities. The Chief Human Resources Officer collaborates with the partnership to address organizational needs and workforce planning. Ultimately, Jung drives the development of a high-performing team capable of delivering superior legal services.

    Eric Edelson - Chief Human Resources Officer

    Eric Edelson, the Chief Human Resources Officer at Simpson Thacher, manages the firm's organizational health and internal communications strategy. Focusing on the operational efficiency of the workforce, the Chief Human Resources Officer implements policies that streamline administrative workflows and support staff well-being. Edelson oversees the integration of diversity and inclusion initiatives into the firm's daily operations, ensuring a supportive environment for all employees. By analyzing workforce data, the Chief Human Resources Officer identifies opportunities to improve retention and morale across the firm's global offices. This leadership role involves managing benefits administration and employee relations to maintain a cohesive corporate culture. Through the development of robust internal feedback loops, Eric Edelson enhances the firm's responsiveness to staff needs. The Chief Human Resources Officer works closely with leadership to ensure that human capital strategies support the firm's long-term mission. Ultimately, Edelson drives the cultural initiatives that sustain the firm's professional standards.

    Frequently Asked Questions Regarding Simpson Thacher Top Executives and Leadership Team

    Who leads Simpson Thacher?
    Simpson Thacher is led by Adrienne Boán (Chief Financial Officer), along with executives such as Willis Gee (Chief Information Officer) and Edina Jung (Chief Human Resources Officer).
    Who is part of Simpson Thacher’s executive team?
    The executive team of Simpson Thacher includes leaders such as Adrienne Boán (Chief Financial Officer), Willis Gee (Chief Information Officer), Edina Jung (Chief Human Resources Officer) and other senior executives.
    How many executives does Simpson Thacher have?
    Simpson Thacher has 4 executives leading key business areas.
    What roles are included in Simpson Thacher’s leadership team?
    The leadership team of Simpson Thacher includes roles such as Chief Financial Officer, Chief Information Officer, Chief Human Resources Officer, Chief Human Resources Officer.