GSK Executive and Leadership Team

June, 2026

Leadership Overview

GSK has 10 executives leading key functions including strategy, finance, operations, and human resources.

Driven by a mission to unite science, technology, and talent, GSK is dedicated to preventing and treating disease, impacting the health of 2.5 billion people by the end of the decade through its innovative medicines and vaccines.

Leadership Roles at GSK

  • Chief Executive Officer (Vietnam) - Toan Duc
  • Chief Financial Officer - Riaz Awan
  • Chief Financial Officer (India) & Whole-Time Director - Ronojit Biswas
  • Chief of Staff - Randy Tillman
  • Manager, Quality of Small Molecules & Chief Marketing Officer - Jesse Parker
  • Manager, Sample and Promotional Operations Chief of Staff, Enterprise Operations - Yvette Gaines
  • Director, Quality & Chief Marketing Officer, Quality - Donna Walker
  • Chief of Staff & Vice President, Medical Services - Antoinette Skalamera
  • Chief Human Resources Officer & Executive VP, Human Resources (India) - Harsh Trehan
  • Digital, Data & Technology Chief of Staff (US) - Michael Escamilla
  • Toan Duc - Chief Executive Officer (Vietnam)

    Toan Duc, the Chief Executive Officer (Vietnam) at GSK, directs the company's strategic vision and operational execution within the Vietnamese market. Duc leads all business activities, driving growth and ensuring the effective delivery of GSK's innovative medicines and vaccines to patients across Vietnam. This leadership role is pivotal in advancing GSK's mission to prevent and treat disease within the region, aligning local operations with global therapeutic priorities such as respiratory, oncology, and infectious diseases. The Chief Executive Officer (Vietnam) oversees market access, commercial strategies, and stakeholder engagement, fostering strong relationships with healthcare providers and regulatory bodies. Toan Duc's leadership ensures that GSK's commitment to improving health outcomes is realized through localized initiatives and a deep understanding of the Vietnamese healthcare landscape. Duc's strategic direction supports GSK's broader objective of positively impacting global health.

    Riaz Awan - Chief Financial Officer

    Riaz Awan, the Chief Financial Officer at GSK, directs the company's financial strategy and fiscal operations. Awan oversees all aspects of financial planning, reporting, and investment, ensuring robust fiscal health for GSK's global operations. This critical role involves managing the financial implications of GSK's research and development pipeline, particularly in its core therapeutic areas of respiratory, immunology and inflammation, oncology, HIV, and infectious diseases. The Chief Financial Officer is instrumental in allocating capital to drive innovation in medicines and vaccines, supporting the company's ambition to impact 2.5 billion lives. Riaz Awan's leadership ensures financial discipline and strategic resource deployment across the organization, from manufacturing to commercial operations. By optimizing financial performance, Awan directly contributes to GSK's market position as a leading pharmaceutical and biotechnology company, underpinning its commitment to long-term growth and patient access to essential healthcare solutions.

    Ronojit Biswas - Chief Financial Officer (India) & Whole-Time Director

    Ronojit Biswas, the Chief Financial Officer (India) & Whole-Time Director at GSK, spearheads financial stewardship and strategic fiscal management within the Indian market. Biswas directs all financial operations, including budgeting, forecasting, and capital allocation, supporting GSK's extensive product portfolio in India. This role is pivotal in ensuring the financial viability and growth of GSK's operations in the region, aligning with the company's global mission to deliver innovative medicines and vaccines. The Chief Financial Officer (India) & Whole-Time Director oversees financial compliance and risk management, safeguarding GSK's assets and reputation. Ronojit Biswas's financial acumen drives operational efficiency and supports the strategic expansion of GSK's therapeutic areas, including respiratory, oncology, and infectious diseases, within India. By managing financial resources effectively, Biswas contributes significantly to GSK's objective of positively impacting health outcomes across the nation.

    Randy Tillman - Chief of Staff

    Randy Tillman, the Chief of Staff at GSK, directs strategic initiatives and operational alignment across global functions. Tillman oversees the coordination of executive priorities, ensuring seamless execution of the company's research and development focus on respiratory, immunology and inflammation, oncology, HIV, and infectious diseases. This leadership role involves managing cross-functional projects that advance GSK's mission to positively impact global health. Tillman drives efficiency in the executive office, facilitating communication and decision-making processes critical to the company's operations. The Chief of Staff ensures that the leadership team's efforts are synchronized with GSK's overarching goals of discovering, developing, manufacturing, and delivering innovative medicines and vaccines. Randy Tillman's oversight extends to supporting the strategic deployment of resources, enabling the company to tackle complex health challenges worldwide and achieve its ambitious targets for patient well-being.

    Jesse Parker - Manager, Quality of Small Molecules & Chief Marketing Officer

    Jesse Parker, the Manager, Quality of Small Molecules & Chief Marketing Officer at GSK, leads dual critical functions essential to product integrity and market penetration. Parker oversees the stringent quality control processes for small molecule pharmaceuticals, ensuring compliance with global regulatory standards and maintaining the highest levels of product safety and efficacy. Concurrently, as Chief Marketing Officer, Jesse Parker directs the strategic marketing initiatives for GSK's diverse product portfolio, encompassing medicines and vaccines across key therapeutic areas. This dual responsibility ensures that quality standards are embedded within marketing strategies, fostering trust and driving adoption of GSK's innovations. Parker's leadership bridges the gap between product development and market delivery, translating scientific advancements into accessible health solutions for patients worldwide. The Manager, Quality of Small Molecules & Chief Marketing Officer plays a vital role in upholding GSK's reputation for excellence and achieving its health impact goals.

    Yvette Gaines - Manager, Sample and Promotional Operations Chief of Staff, Enterprise Operations

    Yvette Gaines, the Manager, Sample and Promotional Operations Chief of Staff, Enterprise Operations at GSK, orchestrates critical logistical and strategic support for the company's operational framework. Gaines manages the intricate processes surrounding sample distribution and promotional activities, ensuring alignment with GSK's commercial objectives and regulatory guidelines. As Chief of Staff for Enterprise Operations, Yvette Gaines provides essential coordination and strategic oversight, facilitating the efficient functioning of various operational departments. This leadership position involves optimizing workflows and enhancing communication channels to support the delivery of GSK's medicines and vaccines globally. The Manager, Sample and Promotional Operations Chief of Staff, Enterprise Operations ensures that operational activities directly contribute to GSK's mission of preventing and treating disease. Gaines's focus on operational excellence supports the company's ambition to positively impact the health of 2.5 billion people by streamlining access to vital healthcare solutions.

    Donna Walker - Director, Quality & Chief Marketing Officer, Quality

    Donna Walker, the Director, Quality & Chief Marketing Officer, Quality at GSK, drives excellence in both product quality assurance and its strategic market communication. Walker leads the comprehensive quality management systems, ensuring that all GSK products, from medicines to vaccines, meet rigorous global standards for safety and efficacy. As Chief Marketing Officer, Quality, Donna Walker develops and executes marketing strategies that highlight GSK's unwavering commitment to quality and patient well-being. This dual role ensures that the integrity of GSK's offerings is effectively communicated to healthcare professionals and patients alike. Walker's leadership is crucial in maintaining GSK's reputation for reliability and innovation across its therapeutic areas, including respiratory, oncology, and infectious diseases. By integrating quality principles into marketing efforts, Donna Walker significantly contributes to GSK's mission of preventing and treating disease and achieving its ambitious health impact goals.

    Antoinette Skalamera - Chief of Staff & Vice President, Medical Services

    Antoinette Skalamera, the Chief of Staff & Vice President, Medical Services at GSK, provides strategic leadership and operational oversight for critical medical functions. Skalamera directs the coordination of medical services, ensuring alignment with GSK's research and development objectives in areas like respiratory, immunology, oncology, and infectious diseases. As Chief of Staff, Antoinette Skalamera facilitates executive decision-making and drives key initiatives across the organization, enhancing operational efficiency and strategic execution. This dual role is essential for translating scientific advancements into tangible health benefits for patients worldwide. The Vice President, Medical Services oversees the implementation of medical strategies that support the company's mission to prevent and treat disease. Antoinette Skalamera's leadership ensures that GSK's medical operations are robust, compliant, and effectively contribute to achieving the company's ambitious goal of impacting 2.5 billion lives.

    Harsh Trehan - Chief Human Resources Officer & Executive VP, Human Resources (India)

    Harsh Trehan, the Chief Human Resources Officer & Executive VP, Human Resources (India) at GSK, leads the strategic direction and execution of human capital management within India. Trehan oversees all aspects of HR, including talent acquisition, development, and employee engagement, ensuring a high-performing workforce aligned with GSK's global mission. This leadership role is critical for fostering a culture that supports innovation in medicines and vaccines, particularly in GSK's key therapeutic areas. The Chief Human Resources Officer & Executive VP, Human Resources (India) drives initiatives that enhance employee well-being and organizational effectiveness, supporting GSK's commitment to its people. Harsh Trehan's expertise ensures that GSK India attracts and retains top talent, crucial for advancing the company's research, development, and commercial operations. By championing people-centric strategies, Trehan significantly contributes to GSK's objective of positively impacting health outcomes in India and globally.
    Harsh Trehan

    Michael Escamilla - Digital, Data & Technology Chief of Staff (US)

    Michael Escamilla, the Digital, Data & Technology Chief of Staff (US) at GSK, drives strategic alignment and operational efficiency within the company's technology functions in the United States. Escamilla oversees the coordination of digital transformation initiatives, data analytics strategies, and technology infrastructure development, supporting GSK's broader business objectives. This role is essential for leveraging cutting-edge technology to accelerate the discovery, development, and delivery of GSK's medicines and vaccines. As Chief of Staff, Michael Escamilla facilitates seamless collaboration between technology teams and other business units, ensuring that digital solutions effectively address market needs and enhance patient access. Escamilla's leadership ensures that GSK's technological capabilities are optimized to support its mission of preventing and treating disease. By driving innovation in digital, data, and technology, Michael Escamilla plays a key part in achieving GSK's ambitious health impact goals.

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    Frequently Asked Questions Regarding GSK Top Executives and Leadership Team

    Who leads GSK?
    GSK is led by Toan Duc (Chief Executive Officer (Vietnam)), along with executives such as Riaz Awan (Chief Financial Officer) and Ronojit Biswas (Chief Financial Officer (India) & Whole-Time Director).
    Who is part of GSK’s executive team?
    The executive team of GSK includes leaders such as Toan Duc (Chief Executive Officer (Vietnam)), Riaz Awan (Chief Financial Officer), Ronojit Biswas (Chief Financial Officer (India) & Whole-Time Director) and other senior executives.
    How many executives does GSK have?
    GSK has 10 executives leading key business areas.
    What roles are included in GSK’s leadership team?
    The leadership team of GSK includes roles such as Chief Executive Officer (Vietnam), Chief Financial Officer, Chief Financial Officer (India) & Whole-Time Director, Chief of Staff, Manager, Quality of Small Molecules & Chief Marketing Officer.