Cabot Executive and Leadership Team

June, 2026

Leadership Overview

Cabot has 5 executives leading key functions including strategy, technology, legal, and materials.

Driven by innovation, Cabot is dedicated to advancing specialty chemicals and performance materials, shaping industries through advanced solutions and a commitment to sustainable practices.

Leadership Roles at Cabot

  • President & Chief Executive Officer - Sean Keohane
  • Senior Vice President & President, Reinforcement Materials - William Masterson
  • Senior VP & President, Reinforcement Materials & President (Americas Region) - Bart Kalkstein
  • Senior Vice President and Chief Technology Officer - Patricia Hubbard
  • Chief Legal Officer - Robyn Scott
  • Sean Keohane - President & Chief Executive Officer

    Sean Keohane, the President & Chief Executive Officer at Cabot, directs the company's overarching strategy and global operations. Keohane guides Cabot's mission to deliver innovative specialty chemicals and performance materials, ensuring alignment with market demands and long-term growth objectives. This leadership involves overseeing all business units and functional departments, driving operational excellence and fostering a culture of continuous improvement. Keohane's strategic vision shapes the company's approach to sustainability and its impact on industries worldwide. By focusing on key growth areas and market opportunities, Sean Keohane ensures Cabot maintains its competitive edge in the global specialty materials sector. The Chief Executive Officer's role is central to articulating the company's value proposition to stakeholders and driving financial performance.
    Sean Keohane

    William Masterson - Senior Vice President & President, Reinforcement Materials

    William Masterson, the Senior Vice President & President, Reinforcement Materials at Cabot, leads the strategic direction and operational performance of the Reinforcement Materials business segment. Masterson drives growth and innovation within this critical division, focusing on rubber and specialty carbons that enhance tire performance and other industrial applications. This leadership involves managing global sales, marketing, and manufacturing operations for reinforcement materials, ensuring product quality and customer satisfaction. The President, Reinforcement Materials' role is pivotal in developing market strategies and expanding Cabot's presence in key automotive and industrial sectors. William Masterson's focus on operational efficiency and product development directly supports the company's mission to provide high-performance materials. Masterson's oversight ensures the segment's contribution to Cabot's overall financial success and market leadership.
    William Masterson

    Bart Kalkstein - Senior VP & President, Reinforcement Materials & President (Americas Region)

    Bart Kalkstein, the Senior VP & President, Reinforcement Materials & President (Americas Region) at Cabot, directs both the Reinforcement Materials business and the company's operations across the Americas. Kalkstein oversees the strategic execution of the Reinforcement Materials segment while simultaneously managing regional business development and market penetration throughout North and South America. This dual leadership ensures cohesive strategy implementation and optimized performance across diverse geographies. The President (Americas Region)'s responsibilities include driving revenue growth, managing regional P&Ls, and fostering strong customer relationships within the Americas. Bart Kalkstein's comprehensive oversight contributes significantly to Cabot's global market position and operational effectiveness. Kalkstein's leadership ensures alignment between global business unit objectives and regional market dynamics.

    Patricia Hubbard - Senior Vice President and Chief Technology Officer

    Patricia Hubbard, the Senior Vice President and Chief Technology Officer at Cabot, spearheads the company's innovation pipeline and technological advancements. Hubbard directs research and development initiatives, focusing on creating next-generation specialty chemicals and performance materials that address evolving customer needs and market trends. This involves managing global R&D teams and fostering collaboration across scientific disciplines to accelerate product development cycles. The Chief Technology Officer's leadership ensures Cabot remains at the forefront of material science, driving the creation of solutions for applications ranging from automotive to electronics. By championing new technologies and sustainable innovations, Patricia Hubbard significantly contributes to the company's competitive advantage and its ability to deliver high-performance products. Hubbard's oversight extends to intellectual property strategy and the integration of cutting-edge research into commercial applications.
    Patricia Hubbard
    Robyn Scott, the Chief Legal Officer at Cabot, provides strategic legal counsel and oversees all legal affairs for the corporation. Scott directs the company's legal framework, ensuring compliance with global regulations and managing corporate governance matters. This role involves advising senior leadership on legal risks and opportunities, safeguarding the company's interests across all jurisdictions. The Chief Legal Officer's responsibilities include managing litigation, intellectual property protection, and contract negotiations, supporting Cabot's business objectives. Robyn Scott plays a critical part in maintaining the company's ethical standards and robust legal posture. Scott's expertise is essential for navigating the complex legal landscape inherent in the specialty chemicals and performance materials industry, ensuring operational integrity and mitigating potential liabilities.

    Frequently Asked Questions Regarding Cabot Top Executives and Leadership Team

    Who leads Cabot?
    Cabot is led by Sean Keohane (President & Chief Executive Officer), along with executives such as William Masterson (Senior Vice President & President, Reinforcement Materials) and Bart Kalkstein (Senior VP & President, Reinforcement Materials & President (Americas Region)).
    Who is part of Cabot’s executive team?
    The executive team of Cabot includes leaders such as Sean Keohane (President & Chief Executive Officer), William Masterson (Senior Vice President & President, Reinforcement Materials), Bart Kalkstein (Senior VP & President, Reinforcement Materials & President (Americas Region)) and other senior executives.
    How many executives does Cabot have?
    Cabot has 5 executives leading key business areas.
    What roles are included in Cabot’s leadership team?
    The leadership team of Cabot includes roles such as President & Chief Executive Officer, Senior Vice President & President, Reinforcement Materials, Senior VP & President, Reinforcement Materials & President (Americas Region), Senior Vice President and Chief Technology Officer, Chief Legal Officer.