Eisai Executive and Leadership Team

May, 2026

Leadership Overview

Eisai has 6 executives leading key functions including strategy, operations, scientific research, machinery, partnership management, and general management.

Driven by a commitment to patient well-being, Eisai focuses on developing innovative pharmaceutical products to address unmet medical needs, particularly in neurology and oncology, aiming to improve global health outcomes.

Leadership Roles at Eisai

  • President & Chief Executive Officer & Scientific Chief & Officer - Toshio Imai
  • President & Chief Operating Officer - Shaji Procida
  • President, Eisai Machinery (USA) - Michael De
  • President, Partnership Management Core Functional Unit - Shawn Gallagher
  • President & General Manager - Jonnahs Singian
  • Chief Scientific Officer - Kenichi Nomoto
  • Toshio Imai - President & Chief Executive Officer & Scientific Chief & Officer

    Toshio Imai, the President & Chief Executive Officer & Scientific Chief & Officer at Eisai, directs the overarching corporate strategy and scientific vision. This leadership role encompasses guiding the company's pharmaceutical research and development efforts, ensuring alignment with global health needs and market opportunities. Imai oversees the advancement of key therapeutic areas, including Alzheimer's disease, dementia with Lewy bodies, epilepsy, and oncology, driving the progression of innovative treatments from discovery through to market. The executive's mandate includes fostering a culture of scientific excellence and rigorous clinical evaluation across all research divisions. By championing groundbreaking scientific initiatives, Toshio Imai ensures Eisai remains at the forefront of pharmaceutical innovation, delivering critical medicines to patients worldwide and solidifying the company's position in the global healthcare landscape.

    Shaji Procida - President & Chief Operating Officer

    Shaji Procida, the President & Chief Operating Officer at Eisai, executes the operational framework that supports the company's global pharmaceutical business. This executive directs the day-to-day functions critical to Eisai's product lifecycle, from manufacturing and supply chain management to commercial operations and market access. Procida ensures efficient resource allocation and operational excellence across all business units, facilitating the seamless delivery of vital medications like Aricept, Methycobal, and Fycompa to patients. The role involves optimizing internal processes and driving cross-functional collaboration to enhance productivity and responsiveness to market demands. By managing the intricate operational complexities, Shaji Procida underpins the company's ability to scale its impact and reliably serve diverse patient populations across various therapeutic areas, including pain management and insomnia treatments.

    Michael De - President, Eisai Machinery (USA)

    Michael De, the President, Eisai Machinery (USA) at Eisai, leads the specialized division focused on advanced manufacturing equipment and solutions. This executive directs the strategic development, production, and distribution of high-precision machinery essential for pharmaceutical manufacturing processes. De oversees operations within the United States, ensuring that Eisai Machinery provides state-of-the-art equipment that meets the stringent quality and efficiency demands of the pharmaceutical industry. The role involves driving technological innovation in machinery design and supporting clients with integrated solutions that enhance production capabilities. By managing this critical segment, Michael De ensures the operational backbone for pharmaceutical production is robust and technologically advanced, supporting Eisai's broader mission of delivering essential medicines.

    Shawn Gallagher - President, Partnership Management Core Functional Unit

    Shawn Gallagher, the President, Partnership Management Core Functional Unit at Eisai, orchestrates strategic alliances and collaborations vital for expanding the company's global reach and therapeutic portfolio. This executive directs the identification, negotiation, and management of key partnerships with external organizations, research institutions, and other pharmaceutical companies. Gallagher's responsibilities include fostering synergistic relationships that accelerate drug development, enhance market access, and drive innovation across Eisai's core therapeutic areas. The focus is on building mutually beneficial collaborations that leverage shared expertise and resources to bring novel treatments to patients more effectively. By cultivating these strategic relationships, Shawn Gallagher significantly contributes to Eisai's growth and its ability to address complex health challenges worldwide.

    Jonnahs Singian - President & General Manager

    Jonnahs Singian, the President & General Manager at Eisai, oversees the comprehensive business operations and strategic direction for a designated region or business unit. This executive is responsible for driving growth, ensuring operational efficiency, and maintaining market leadership within their purview. Singian manages all facets of the business, from commercial activities and product launches to financial performance and regulatory compliance. The role involves leading cross-functional teams to achieve ambitious corporate objectives and uphold Eisai's commitment to patient well-being. By providing decisive leadership and strategic oversight, Jonnahs Singian ensures the effective execution of Eisai's mission, contributing to the company's overall success in delivering innovative pharmaceutical solutions and improving patient outcomes.

    Kenichi Nomoto - Chief Scientific Officer

    Kenichi Nomoto, the Chief Scientific Officer at Eisai, spearheads the company's advanced scientific research and discovery initiatives. This critical role involves charting the course for novel therapeutic development, with a particular emphasis on groundbreaking treatments for neurological disorders and cancer. Nomoto directs the exploration of new scientific frontiers, identifying promising drug candidates and overseeing their preclinical evaluation. The executive's focus extends to fostering innovation within Eisai's research laboratories, ensuring the rigorous scientific validation of potential new medicines. By driving cutting-edge research, Kenichi Nomoto plays a pivotal part in expanding Eisai's pipeline of innovative pharmaceuticals, including agents for thyroid cancer, renal cell carcinoma, and breast cancer, thereby contributing significantly to the company's mission of improving patient lives through scientific advancement.
    Kenichi Nomoto

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    Frequently Asked Questions Regarding Eisai Top Executives and Leadership Team

    Who leads Eisai?
    Eisai is led by Toshio Imai (President & Chief Executive Officer & Scientific Chief & Officer), along with executives such as Shaji Procida (President & Chief Operating Officer) and Michael De (President, Eisai Machinery (USA)).
    Who is part of Eisai’s executive team?
    The executive team of Eisai includes leaders such as Toshio Imai (President & Chief Executive Officer & Scientific Chief & Officer), Shaji Procida (President & Chief Operating Officer), Michael De (President, Eisai Machinery (USA)) and other senior executives.
    How many executives does Eisai have?
    Eisai has 6 executives leading key business areas.
    What roles are included in Eisai’s leadership team?
    The leadership team of Eisai includes roles such as President & Chief Executive Officer & Scientific Chief & Officer, President & Chief Operating Officer, President, Eisai Machinery (USA), President, Partnership Management Core Functional Unit, President & General Manager.