Pfizer Executive and Leadership Team

November, 2026

Leadership Overview

Pfizer has 10 executives leading key functions including corporate strategy, regional market management, financial oversight, and oncology commercialization.

Driven by a commitment to scientific research and medical advancement, Pfizer delivers innovative medicines and vaccines that improve health outcomes and enhance quality of life for patients across the globe.

Leadership Roles at Pfizer

  • Chairman, Chief Executive Officer - John Stafford
  • Interim Chief Financial Officer - Cecile Guegan
  • President, Oncology Commercial - Tina Deignan
  • Global President, Specialty Care (US) - Kevin Sullivan
  • Global President, Emerging Markets - Nick Lagunowich
  • Contract Regulatory Operations Senior Associate & Chief Marketing Officer, S) - Srinivas Yalavarthi
  • Managing Director - Terry Wiley
  • Healthcare Executive - Raman Jain
  • Healthcare Executive - Aaryan Tyagi
  • Healthcare Executive - Sethu Makesh
  • John Stafford - Chairman, Chief Executive Officer

    John Stafford, the Chairman, Chief Executive Officer at Pfizer, directs the overarching corporate strategy and long-term vision for the biopharmaceutical enterprise. Overseeing the global research and development pipeline, the Chairman, Chief Executive Officer ensures that scientific breakthroughs translate into tangible medical solutions for patients worldwide. This leadership role involves constant engagement with the Board to align operational priorities with the mission of delivering life-saving vaccines and therapies. By fostering a culture of innovation, John Stafford maintains the competitive edge of the organization within the complex pharmaceutical landscape. Through rigorous oversight of the entire product lifecycle, the Chairman, Chief Executive Officer secures the future growth of the company while addressing significant global health challenges. Ultimately, Stafford drives the strategic direction that defines the market impact of the organization.

    Cecile Guegan - Interim Chief Financial Officer

    Cecile Guegan, the Interim Chief Financial Officer at Pfizer, directs the financial health and fiscal planning of the global biopharmaceutical organization. Overseeing capital allocation and investment strategies, the Interim Chief Financial Officer ensures that resources support the core mission of discovering and developing innovative medicines. This role involves managing financial reporting, risk assessment, and budgetary controls to maintain the stability of the company. By analyzing market trends and economic indicators, Cecile Guegan provides the insights necessary for informed decision-making at the executive level. The Interim Chief Financial Officer collaborates with other leaders to optimize the financial performance of various business units, ensuring long-term sustainability. Through disciplined fiscal management, Guegan supports the ongoing research and development efforts that define the competitive position of the firm.

    Tina Deignan - President, Oncology Commercial

    Tina Deignan, the President, Oncology Commercial at Pfizer, directs the commercialization strategy for the oncology portfolio, focusing on delivering life-changing cancer therapies to patients. Overseeing the launch and market expansion of specialized oncology products, the President, Oncology Commercial ensures that these breakthrough treatments reach the clinical settings where the need is greatest. This leadership role involves coordinating with medical affairs and sales teams to educate providers on the efficacy of the company's cancer solutions. By driving North American initiatives and expanding the footprint of oncology services, Tina Deignan strengthens the market position of the organization. The President, Oncology Commercial monitors competitive dynamics to adapt strategies that improve patient outcomes. Through targeted commercial efforts, Deignan ensures that the company remains a leader in the fight against cancer.

    Kevin Sullivan - Global President, Specialty Care (US)

    Kevin Sullivan, the Global President, Specialty Care (US) at Pfizer, directs the commercial strategy and operational execution for the specialty care division within the United States. Overseeing the development of specialized treatment pathways, the Global President, Specialty Care (US) ensures that patients with complex health conditions receive timely access to innovative therapies. This leadership role involves managing large-scale sales operations and fostering relationships with key healthcare stakeholders. By driving US-based initiatives, Kevin Sullivan strengthens the market presence of the company in the specialty care segment. The Global President, Specialty Care (US) collaborates with research teams to align product offerings with the evolving needs of the medical community. Through strategic oversight and market analysis, Sullivan ensures the continued success of the specialty care portfolio.
    Kevin Sullivan

    Nick Lagunowich - Global President, Emerging Markets

    Nick Lagunowich, the Global President, Emerging Markets at Pfizer, directs the expansion and commercial strategy for the company across diverse and rapidly growing international regions. Overseeing the adaptation of medical solutions to meet the unique needs of these markets, the Global President, Emerging Markets ensures that the company maintains a strong presence in developing economies. This leadership role involves navigating complex regulatory environments and building local partnerships to facilitate the distribution of essential medicines. By driving EMEA and other regional expansion initiatives, Nick Lagunowich increases the global footprint of the organization. The Global President, Emerging Markets focuses on tailoring commercial approaches to maximize patient access and market share. Through strategic planning and regional expertise, Lagunowich secures the growth of the company in key emerging markets.
    Nick Lagunowich

    Srinivas Yalavarthi - Contract Regulatory Operations Senior Associate & Chief Marketing Officer, S)

    Srinivas Yalavarthi, the Contract Regulatory Operations Senior Associate & Chief Marketing Officer, S) at Pfizer, architects the commercial strategy and regulatory compliance frameworks necessary for bringing new products to market. Overseeing the alignment between marketing initiatives and regulatory requirements, the Contract Regulatory Operations Senior Associate & Chief Marketing Officer, S) ensures that all promotional activities adhere to strict industry standards. This leadership role involves managing complex data sets to inform market positioning and product messaging. By bridging the gap between regulatory operations and commercial outreach, Srinivas Yalavarthi accelerates the adoption of breakthrough therapies. The Contract Regulatory Operations Senior Associate & Chief Marketing Officer, S) drives engagement with healthcare providers to maximize the reach of the company's medical solutions. Through strategic planning and operational precision, Yalavarthi secures the market presence of the organization.

    Terry Wiley - Managing Director

    Terry Wiley, the Managing Director at Pfizer, executes operational excellence across key business units to ensure the seamless delivery of healthcare solutions. Overseeing the integration of manufacturing and distribution processes, the Managing Director optimizes the supply chain to meet the high demand for essential medicines. This role requires close collaboration with regional leaders to maintain consistent quality standards and regulatory compliance across diverse markets. By streamlining internal workflows, Terry Wiley enhances the efficiency of the organization, allowing for faster deployment of new therapies. The Managing Director focuses on scaling operations to support the broad portfolio of the company, ensuring that medical advancements reach patients effectively. Through meticulous management of resources and infrastructure, Wiley sustains the operational integrity required to support the global mission of the firm.

    Raman Jain - Healthcare Executive

    Raman Jain, the Healthcare Executive at Pfizer, directs strategic initiatives aimed at enhancing the delivery of healthcare solutions across the organization. Overseeing the integration of digital health tools and patient-centric services, the Healthcare Executive ensures that the company remains at the forefront of medical innovation. This role involves collaborating with cross-functional teams to identify opportunities for improving patient access to essential medicines. By analyzing healthcare trends and operational data, Raman Jain develops strategies that optimize the impact of the company's product portfolio. The Healthcare Executive focuses on building partnerships that expand the reach of the firm into new clinical areas. Through a commitment to operational excellence and patient outcomes, Jain drives the growth of the organization within the competitive biopharmaceutical sector.

    Aaryan Tyagi - Healthcare Executive

    Aaryan Tyagi, the Healthcare Executive at Pfizer, directs the implementation of strategic programs designed to improve the efficiency and effectiveness of healthcare delivery. Overseeing the coordination between internal departments and external partners, the Healthcare Executive ensures that the company's medical solutions are deployed with maximum impact. This role involves managing complex projects that support the development and distribution of innovative vaccines and medicines. By focusing on process improvement and resource optimization, Aaryan Tyagi enhances the operational capabilities of the organization. The Healthcare Executive collaborates with other leaders to align business objectives with the overarching mission of improving global health outcomes. Through a focus on innovation and strategic execution, Tyagi contributes to the long-term growth and market leadership of the firm.

    Sethu Makesh - Healthcare Executive

    Sethu Makesh, the Healthcare Executive at Pfizer, directs the strategic development of programs that support the company's mission of delivering innovative healthcare solutions. Overseeing the alignment of clinical research with commercial goals, the Healthcare Executive ensures that the organization remains responsive to the needs of the global medical community. This role involves managing cross-functional teams to drive the success of key therapeutic areas. By analyzing market data and patient outcomes, Sethu Makesh develops strategies that enhance the value of the company's product offerings. The Healthcare Executive collaborates with other C-suite leaders to ensure that operational activities support the long-term vision of the firm. Through a focus on innovation and strategic execution, Makesh contributes to the continued success and market impact of the organization.

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    Frequently Asked Questions Regarding Pfizer Top Executives and Leadership Team

    Who leads Pfizer?
    Pfizer is led by John Stafford (Chairman, Chief Executive Officer), along with executives such as Cecile Guegan (Interim Chief Financial Officer) and Tina Deignan (President, Oncology Commercial).
    Who is part of Pfizer’s executive team?
    The executive team of Pfizer includes leaders such as John Stafford (Chairman, Chief Executive Officer), Cecile Guegan (Interim Chief Financial Officer), Tina Deignan (President, Oncology Commercial) and other senior executives.
    How many executives does Pfizer have?
    Pfizer has 10 executives leading key business areas.
    What roles are included in Pfizer’s leadership team?
    The leadership team of Pfizer includes roles such as Chairman, Chief Executive Officer, Interim Chief Financial Officer, President, Oncology Commercial, Global President, Specialty Care (US), Global President, Emerging Markets.