Simpson Thacher Executive and Leadership Team

May, 2026

Leadership Overview

Simpson Thacher has 5 executives leading key functions including operations, finance, information technology, and human resources.

Driven by a commitment to excellence, Simpson Thacher provides coordinated legal advice and transactional capability, leveraging a deep understanding of complex global markets to serve its clients.

Leadership Roles at Simpson Thacher

  • Chief Financial Officer - Adrienne Boan
  • Chief Operating Officer - Kelly Stevens
  • Chief Information Officer - Willis Gee
  • Chief Human Resources Officer - Eric Edelson
  • Chief Human Resources Officer - Edina Jung
  • Adrienne Boan - Chief Financial Officer

    Adrienne Boan, the Chief Financial Officer at Simpson Thacher, manages the firm's financial strategy and operations. Boan oversees all aspects of financial planning, budgeting, and reporting, ensuring fiscal responsibility and sustainable growth. This critical role involves managing capital, analyzing financial performance, and developing strategies to enhance profitability and manage risk. Boan directs the accounting, treasury, and financial analysis functions, providing essential insights to guide executive decision-making. The Chief Financial Officer's responsibilities include optimizing financial resources, securing funding when necessary, and ensuring compliance with all financial regulations. By maintaining rigorous financial controls and fostering strong relationships with financial institutions, Adrienne Boan safeguards the firm's financial health. Boan's leadership ensures that financial strategies directly support the firm's long-term objectives and its capacity to deliver comprehensive legal services globally.
    Adrienne Boan

    Kelly Stevens - Chief Operating Officer

    Kelly Stevens, the Chief Operating Officer at Simpson Thacher, directs the firm's operational infrastructure and administrative functions. Stevens oversees the strategic implementation of business processes, ensuring maximum efficiency across all departments. This leadership role involves managing the firm's non-legal operations, including finance, IT, human resources, and facilities management, to support the delivery of exceptional legal services. Stevens drives initiatives focused on operational excellence and resource optimization, aligning the firm's internal capabilities with its strategic objectives. By streamlining workflows and enhancing service delivery, Stevens ensures the firm operates at peak performance, enabling legal teams to concentrate on client matters. The Chief Operating Officer's purview extends to fostering a productive work environment and implementing best practices in firm management. Stevens's strategic oversight guarantees that the firm's operational backbone is robust and scalable, supporting continued growth and client satisfaction.

    Willis Gee - Chief Information Officer

    Willis Gee, the Chief Information Officer at Simpson Thacher, leads the firm's technology strategy and infrastructure. Gee directs the development and implementation of innovative IT solutions that enhance operational efficiency and client service delivery. This role encompasses overseeing all aspects of information technology, including cybersecurity, data management, and digital transformation initiatives. Gee ensures that the firm's technological resources are secure, reliable, and aligned with its business objectives. The Chief Information Officer's responsibilities include managing the IT department, evaluating emerging technologies, and driving digital innovation across the firm. By championing technological advancements, Willis Gee empowers legal professionals with the tools needed to provide cutting-edge legal advice. Gee's strategic vision for technology strengthens the firm's competitive position and its ability to navigate the evolving digital landscape.
    Willis Gee

    Eric Edelson - Chief Human Resources Officer

    Eric Edelson, the Chief Human Resources Officer at Simpson Thacher, directs the firm's human capital strategy and operations. Edelson oversees talent acquisition, employee development, compensation, and benefits programs, fostering a high-performance culture. This leadership position involves ensuring that HR policies and practices support the firm's strategic goals and promote employee engagement and retention. Edelson manages the HR department, focusing on creating a supportive and inclusive work environment that attracts and retains top legal talent. The Chief Human Resources Officer's responsibilities include developing and implementing HR initiatives that align with the firm's mission and values. By cultivating a strong organizational culture and investing in employee growth, Eric Edelson enhances the firm's ability to deliver exceptional legal services. Edelson's strategic approach to human resources strengthens the firm's most valuable asset: its people.

    Edina Jung - Chief Human Resources Officer

    Edina Jung, the Chief Human Resources Officer at Simpson Thacher, spearheads initiatives focused on talent management and organizational development. Jung oversees the strategic planning and execution of programs designed to enhance employee experience and professional growth. This role involves collaborating with firm leadership to align HR strategies with the firm's overarching business objectives, ensuring a cohesive approach to talent. Jung directs efforts in areas such as performance management, employee relations, and diversity and inclusion, fostering a dynamic and equitable workplace. The Chief Human Resources Officer's responsibilities include developing innovative HR solutions that support the firm's commitment to excellence and client service. By championing employee well-being and career advancement, Edina Jung contributes significantly to the firm's success. Jung's leadership ensures that Simpson Thacher remains an employer of choice, attracting and retaining skilled professionals.

    Frequently Asked Questions Regarding Simpson Thacher Top Executives and Leadership Team

    Who leads Simpson Thacher?
    Simpson Thacher is led by Adrienne Boan (Chief Financial Officer), along with executives such as Kelly Stevens (Chief Operating Officer) and Willis Gee (Chief Information Officer).
    Who is part of Simpson Thacher’s executive team?
    The executive team of Simpson Thacher includes leaders such as Adrienne Boan (Chief Financial Officer), Kelly Stevens (Chief Operating Officer), Willis Gee (Chief Information Officer) and other senior executives.
    How many executives does Simpson Thacher have?
    Simpson Thacher has 5 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 Operating Officer, Chief Information Officer, Chief Human Resources Officer, Chief Human Resources Officer.