Regeneron Executive and Leadership Team

November, 2026

Leadership Overview

Regeneron has 6 executives leading key functions including strategy, scientific research, regulatory compliance, human resources, and operational management.

Driven by a commitment to scientific excellence, Regeneron advances biotechnology through the discovery and commercialization of innovative medicines for serious diseases, aiming to transform patient outcomes globally.

Leadership Roles at Regeneron

  • Chief Executive Officer - Antalio Ubalde
  • Co-Chair, President & Chief Executive Officer - Leonard Schleifer
  • President & Scientific Office Chief & Co-Founder - George Yancopoulos
  • Head Operations Strategy, To Chief of Staff & Executive VP, Regulatory, Patient Safety & Quality - Kim Brenner
  • Strategic HR Business Partner & To Chief of Staff & Vice President, Human Resources - Erin Rohr
  • Executive Assistant To the Chief Human Resources Officer - Wrechelle Nantes
  • Antalio Ubalde - Chief Executive Officer

    Antalio Ubalde, the Chief Executive Officer at Regeneron, directs the overarching corporate strategy and long-term vision for the biotechnology enterprise. By aligning research initiatives with commercial goals, the Chief Executive Officer ensures the organization maintains a competitive edge in the pharmaceutical market. Antalio Ubalde oversees the integration of proprietary technologies into the drug development pipeline, focusing on high-impact treatments for cancer and inflammatory disorders. This leadership role involves constant collaboration with the Board to optimize resource allocation and drive sustainable growth across North American and international markets. Through rigorous oversight of organizational performance, the Chief Executive Officer maintains focus on the core mission of delivering life-changing therapies. Ultimately, the executive secures the financial and operational health of the company while fostering a culture of scientific innovation and excellence in patient care.

    Leonard Schleifer - Co-Chair, President & Chief Executive Officer

    Leonard Schleifer, the Co-Chair, President & Chief Executive Officer at Regeneron, architects the strategic framework for the discovery and development of innovative medicines. As the Co-Chair, President & Chief Executive Officer, Schleifer drives the company's scientific agenda, ensuring that proprietary technologies translate into effective treatments for serious diseases. This leadership position involves managing complex relationships with stakeholders and guiding the executive team toward achieving ambitious clinical milestones. Leonard Schleifer monitors the global pharmaceutical landscape to identify emerging opportunities for expansion and therapeutic advancement. By balancing scientific rigor with commercial viability, the executive ensures that the organization remains at the forefront of biotechnology. Through consistent focus on operational efficiency and research breakthroughs, Schleifer supports the delivery of life-changing therapies to patients worldwide, reinforcing the company's reputation as a leader in the pharmaceutical industry.
    Leonard Schleifer

    George Yancopoulos - President & Scientific Office Chief & Co-Founder

    George Yancopoulos, the President & Scientific Office Chief & Co-Founder at Regeneron, leads the scientific vision and research efforts that define the company's biotechnology portfolio. As the President & Scientific Office Chief & Co-Founder, Yancopoulos directs the discovery of innovative medicines for conditions such as cancer and inflammatory disorders. This leadership role involves overseeing the proprietary technology platforms that enable the rapid development of life-changing therapies. George Yancopoulos collaborates with research teams to push the boundaries of science, ensuring that the company remains a pioneer in the pharmaceutical industry. By fostering an environment of rigorous inquiry and innovation, the executive drives the development of a robust pipeline of clinical candidates. Through strategic oversight of scientific operations, Yancopoulos ensures that the organization consistently delivers high-quality, impactful treatments to patients, maintaining the company's position as a global leader in medical research.

    Kim Brenner - Head Operations Strategy, To Chief of Staff & Executive VP, Regulatory, Patient Safety & Quality

    Kim Brenner, the Head Operations Strategy, To Chief of Staff & Executive VP, Regulatory, Patient Safety & Quality at Regeneron, manages the critical intersection of regulatory compliance and operational efficiency. Overseeing the global regulatory framework, the Head Operations Strategy, To Chief of Staff & Executive VP, Regulatory, Patient Safety & Quality ensures that all drug development processes meet stringent safety and quality standards. Kim Brenner directs the integration of patient safety protocols into the broader corporate strategy, facilitating seamless communication between research teams and regulatory bodies. This role involves mitigating risks associated with clinical trials and commercial product distribution across diverse geographic regions. By optimizing internal workflows, the executive supports the rapid advancement of life-changing medicines. Through meticulous attention to detail and strategic planning, Brenner maintains the integrity of the company's product portfolio while ensuring adherence to international health regulations.

    Erin Rohr - Strategic HR Business Partner & To Chief of Staff & Vice President, Human Resources

    Erin Rohr, the Strategic HR Business Partner & To Chief of Staff & Vice President, Human Resources at Regeneron, designs the talent acquisition and organizational development strategies necessary to support a high-growth biotechnology firm. As the Strategic HR Business Partner & To Chief of Staff & Vice President, Human Resources, Rohr cultivates a workforce capable of executing complex scientific research and commercialization efforts. This leadership role involves aligning human capital initiatives with the company's mission to discover innovative medicines for serious diseases. Erin Rohr manages internal culture and leadership development programs, ensuring that the organization attracts and retains top-tier scientific and operational talent. By implementing scalable HR systems, the executive supports the company's expansion across global markets. Through strategic workforce planning and performance management, Rohr drives organizational agility, enabling the firm to maintain its competitive advantage in the rapidly evolving pharmaceutical sector.

    Wrechelle Nantes - Executive Assistant To the Chief Human Resources Officer

    Wrechelle Nantes, the Executive Assistant To the Chief Human Resources Officer at Regeneron, coordinates the administrative and operational functions of the human resources department. Supporting the Chief Human Resources Officer, the Executive Assistant To the Chief Human Resources Officer manages complex scheduling, internal communications, and project tracking to ensure the department meets its strategic objectives. Wrechelle Nantes facilitates the flow of information between HR leadership and other executive teams, enabling efficient decision-making regarding talent management and organizational culture. This role involves overseeing the logistics of large-scale recruitment and employee engagement initiatives that support the company's mission of developing life-changing treatments. By streamlining administrative processes, the executive ensures that the HR function remains focused on high-level strategic goals. Through proactive management of departmental resources, Nantes contributes to the overall operational effectiveness of the company's human capital strategy.

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    Frequently Asked Questions Regarding Regeneron Top Executives and Leadership Team

    Who leads Regeneron?
    Regeneron is led by Antalio Ubalde (Chief Executive Officer), along with executives such as Leonard Schleifer (Co-Chair, President & Chief Executive Officer) and George Yancopoulos (President & Scientific Office Chief & Co-Founder).
    Who is part of Regeneron’s executive team?
    The executive team of Regeneron includes leaders such as Antalio Ubalde (Chief Executive Officer), Leonard Schleifer (Co-Chair, President & Chief Executive Officer), George Yancopoulos (President & Scientific Office Chief & Co-Founder) and other senior executives.
    How many executives does Regeneron have?
    Regeneron has 6 executives leading key business areas.
    What roles are included in Regeneron’s leadership team?
    The leadership team of Regeneron includes roles such as Chief Executive Officer, Co-Chair, President & Chief Executive Officer, President & Scientific Office Chief & Co-Founder, Head Operations Strategy, To Chief of Staff & Executive VP, Regulatory, Patient Safety & Quality, Strategic HR Business Partner & To Chief of Staff & Vice President, Human Resources.