TSI Executive and Leadership Team

July, 2026

Leadership Overview

TSI has 10 executives leading key functions including strategy, technology, and operations.

Driven by innovation, TSI provides measurement, application guidance, and data analytics solutions across occupational health & safety, research, HVAC, environmental, healthcare, and manufacturing sectors, impacting global industries through precise instrumentation.

Leadership Roles at TSI

  • Chief Executive Officer - Sang Kim
  • Chief Executive Officer & President - Michael Ellis
  • Chief Executive Officer & Founder - Vantonio Fraley
  • President & Chief Executive Officer - Thomas Kennedy
  • President - Thomas Sorenson
  • President - Darrick Niccum
  • President - Brad Peestrip
  • President - Francis Bartlett
  • President - Terry Toliver
  • Chief Technology Officer - Charles Glass
  • Sang Kim - Chief Executive Officer

    Sang Kim, the Chief Executive Officer at TSI, directs the company's overarching strategy and operational execution. Kim guides TSI's mission to deliver advanced measurement, application guidance, and data analytics solutions. This leadership role ensures TSI's instruments effectively serve critical industries such as occupational health & safety, research, HVAC, environmental, healthcare, and manufacturing. Kim's focus involves driving innovation in instrumentation technology and expanding market reach. By aligning departmental objectives with corporate goals, Sang Kim ensures the company's continued growth and its commitment to providing high-quality data and analytics for diverse industrial applications. Kim's strategic vision shapes TSI's product development and market positioning, reinforcing its status as a leader in precision measurement.

    Michael Ellis - Chief Executive Officer & President

    Michael Ellis, the Chief Executive Officer & President at TSI, spearheads the company's strategic direction and operational management. Ellis oversees the development and deployment of TSI's comprehensive suite of measurement, application guidance, and data analytics solutions. This executive leadership ensures TSI's instruments meet the rigorous demands of industries including occupational health & safety, research, HVAC, environmental, healthcare, and manufacturing. Ellis's responsibilities encompass driving technological advancements and fostering market expansion. By integrating strategic initiatives across all business units, Michael Ellis guarantees the effective delivery of precise instrumentation and data-driven insights. The leadership of Ellis is pivotal in maintaining TSI's reputation for quality and innovation in the global market.

    Vantonio Fraley - Chief Executive Officer & Founder

    Vantonio Fraley, the Chief Executive Officer & Founder at TSI, established the company's foundational principles and continues to shape its strategic trajectory. Fraley's vision drives TSI's commitment to building instruments that provide essential measurement, application guidance, and data analytics solutions. This leadership ensures the company's offerings are tailored to the specific needs of industries such as occupational health & safety, research, HVAC, environmental, healthcare, and manufacturing. Fraley's ongoing involvement focuses on maintaining the company's innovative spirit and market leadership. By guiding the core mission, Vantonio Fraley ensures TSI remains at the forefront of technological development in precision instrumentation. The founder's enduring influence is critical to TSI's sustained success and industry impact.
    Vantonio Fraley

    Thomas Kennedy - President & Chief Executive Officer

    Thomas Kennedy, the President & Chief Executive Officer at TSI, directs the company's comprehensive business operations and strategic growth initiatives. Kennedy leads the organization in delivering sophisticated measurement, application guidance, and data analytics solutions critical to sectors like occupational health & safety, research, HVAC, environmental, healthcare, and manufacturing. This executive role ensures TSI's advanced instrumentation consistently meets evolving industry standards and client requirements. Kennedy's oversight extends to fostering innovation and expanding the company's global footprint. Through strategic planning and operational efficiency, Thomas Kennedy drives TSI's commitment to providing precise, reliable data and analytical tools. The leadership of Kennedy is fundamental to maintaining TSI's competitive edge and market prominence.
    Thomas Kennedy

    Thomas Sorenson - President

    Thomas Sorenson, the President at TSI, manages key operational divisions and drives strategic initiatives to enhance market performance. Sorenson oversees the execution of TSI's mission to provide essential measurement, application guidance, and data analytics solutions across diverse industries. This leadership ensures the effective delivery of instruments for occupational health & safety, research, HVAC, environmental, healthcare, and manufacturing sectors. Sorenson's focus involves optimizing operational efficiency and expanding market penetration. By aligning departmental functions with company objectives, Thomas Sorenson contributes significantly to TSI's sustained growth and its reputation for quality. The President's role is vital in translating strategic goals into tangible business outcomes.

    Darrick Niccum - President

    Darrick Niccum, the President at TSI, directs significant operational segments and champions strategic growth opportunities. Niccum leads efforts to deliver TSI's specialized measurement, application guidance, and data analytics solutions to critical markets. This executive function ensures the company's instruments effectively support occupational health & safety, research, HVAC, environmental, healthcare, and manufacturing industries. Niccum's responsibilities include enhancing operational workflows and expanding the company's service capabilities. By fostering collaboration across teams, Darrick Niccum ensures TSI consistently meets client needs and industry demands. The President's strategic oversight is crucial for maintaining TSI's leadership in precision instrumentation and data analysis.

    Brad Peestrip - President

    Brad Peestrip, the President at TSI, oversees critical business units and drives strategic initiatives for market expansion. Peestrip leads the implementation of TSI's core offerings, including measurement, application guidance, and data analytics solutions, serving vital sectors. This executive role ensures the company's instruments are optimized for occupational health & safety, research, HVAC, environmental, healthcare, and manufacturing industries. Peestrip's focus involves improving operational effectiveness and strengthening customer relationships. By guiding strategic planning and execution, Brad Peestrip ensures TSI's continued success and its commitment to delivering high-value solutions. The President's leadership is instrumental in achieving company objectives and enhancing market presence.

    Francis Bartlett - President

    Francis Bartlett, the President at TSI, manages key operational areas and spearheads strategic development initiatives. Bartlett leads the organization in providing advanced measurement, application guidance, and data analytics solutions tailored for industries such as occupational health & safety, research, HVAC, environmental, healthcare, and manufacturing. This executive position ensures TSI's instruments deliver precise and reliable data for critical applications. Bartlett's responsibilities include driving operational excellence and fostering innovation within the company. By overseeing strategic implementation, Francis Bartlett ensures TSI maintains its competitive edge and commitment to quality. The President's leadership is vital for advancing TSI's mission and expanding its market impact.
    Francis Bartlett

    Terry Toliver - President

    Terry Toliver, the President at TSI, directs significant operational functions and champions strategic growth strategies. Toliver leads the company's efforts in delivering specialized measurement, application guidance, and data analytics solutions to key industrial sectors. This executive role ensures TSI's instruments effectively support the demanding requirements of occupational health & safety, research, HVAC, environmental, healthcare, and manufacturing. Toliver's responsibilities include enhancing operational performance and expanding the company's service portfolio. By guiding cross-functional teams, Terry Toliver ensures TSI consistently meets evolving market needs and client expectations. The President's strategic direction is crucial for reinforcing TSI's industry leadership and driving future innovation.

    Charles Glass - Chief Technology Officer

    Charles Glass, the Chief Technology Officer at TSI, architects the company's technological vision and product development roadmap. Glass oversees the innovation and engineering of TSI's advanced measurement instruments and data analytics platforms. This critical role ensures that TSI's solutions effectively address the complex challenges within occupational health & safety, research, HVAC, environmental, healthcare, and manufacturing industries. Glass's responsibilities include driving research and development efforts, enhancing product performance, and integrating cutting-edge technologies. By leading the technology division, Charles Glass ensures TSI maintains its position at the forefront of instrumentation innovation. The CTO's strategic guidance is essential for developing next-generation tools that provide superior measurement and analytical capabilities.

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    Frequently Asked Questions Regarding TSI Top Executives and Leadership Team

    Who leads TSI?
    TSI is led by Sang Kim (Chief Executive Officer), along with executives such as Michael Ellis (Chief Executive Officer & President) and Vantonio Fraley (Chief Executive Officer & Founder).
    Who is part of TSI’s executive team?
    The executive team of TSI includes leaders such as Sang Kim (Chief Executive Officer), Michael Ellis (Chief Executive Officer & President), Vantonio Fraley (Chief Executive Officer & Founder) and other senior executives.
    How many executives does TSI have?
    TSI has 10 executives leading key business areas.
    What roles are included in TSI’s leadership team?
    The leadership team of TSI includes roles such as Chief Executive Officer, Chief Executive Officer & President, Chief Executive Officer & Founder, President & Chief Executive Officer, President.