W.W. Williams Executive and Leadership Team

May, 2026

Leadership Overview

W.W. Williams has 5 executives leading key functions including strategy, finance, human resources, and operations.

Driven by a century of expertise, W.W. Williams powers industrial operations through comprehensive sales and service networks, delivering essential repair, OEM product sales, and advanced supply chain management solutions across diverse sectors.

Leadership Roles at W.W. Williams

  • Chairman & Chief Executive Officer - John Simmons
  • Chief Financial Officer - Jason Onsen
  • President - Bill Van Ess
  • President - Carol MacIntyre
  • Chief Human Resources Officer - Dianah Bogan
  • John Simmons - Chairman & Chief Executive Officer

    John Simmons, the Chairman & Chief Executive Officer at W.W. Williams, directs the overarching corporate strategy and vision for the industrial power products sales and service network. Simmons guides the company's expansion and operational efficiency, ensuring alignment with market demands for diesel engines, transmissions, and power generation systems. This leadership role involves setting the strategic direction for bumper-to-bumper truck repair and transport refrigeration services, crucial components of the company's service offerings. Simmons also oversees the integration of supply chain logistics services, enhancing the company's ability to support on-highway truck fleets and off-highway equipment users. The Chairman & Chief Executive Officer's focus remains on driving sustainable growth and maintaining W.W. Williams' position as a leader in the industrial power products sector. John Simmons ensures the company's long-term viability and market impact through decisive leadership and strategic planning.

    Jason Onsen - Chief Financial Officer

    Jason Onsen, the Chief Financial Officer at W.W. Williams, manages all financial operations and fiscal strategy for the industrial power products sales and service network. Onsen oversees budgeting, financial planning, and risk management, ensuring the company's financial health and stability across its diverse service offerings, including diesel engines, transmissions, and transport refrigeration. This executive directs capital allocation for investments in service and repair capabilities and OEM product sales, supporting commercial facility owners and marine equipment owners. The Chief Financial Officer's responsibilities extend to optimizing supply chain management solutions and logistics services, directly impacting profitability and operational efficiency. By analyzing financial performance and market trends, Onsen provides critical insights to guide strategic decisions. Jason Onsen ensures robust financial controls and drives initiatives that enhance shareholder value and support the company's growth objectives.
    Jason Onsen

    Bill Van Ess - President

    Bill Van Ess, the President at W.W. Williams, drives operational execution and strategic initiatives across the industrial power products sales and service network. Van Ess oversees the day-to-day management of service and repair departments, ensuring the highest standards in diesel engine and transmission servicing, as well as bumper-to-bumper truck repair. This leadership position involves optimizing the supply chain management solutions and logistics services that are fundamental to the company's offerings. The President works closely with other executives to enhance customer satisfaction for on-highway truck fleets, off-highway equipment users, commercial facility owners, and marine equipment owners. Van Ess focuses on operational efficiency and service delivery excellence in areas such as transport refrigeration and power generation systems. Bill Van Ess's strategic oversight ensures seamless integration of OEM product sales with comprehensive after-sales support, reinforcing W.W. Williams' market leadership.

    Carol MacIntyre - President

    Carol MacIntyre, the President at W.W. Williams, directs key strategic growth areas and market expansion for the industrial power products sales and service network. MacIntyre focuses on developing new business opportunities and strengthening existing partnerships, particularly in the OEM product sales and supply chain management solutions sectors. This executive champions initiatives aimed at enhancing the company's service portfolio, which includes diesel engines, transmissions, transport refrigeration, and power generation systems. The President plays a pivotal role in ensuring that W.W. Williams effectively serves diverse client segments, from on-highway truck fleets to marine equipment owners. MacIntyre's leadership emphasizes innovation in service delivery and operational excellence, particularly in complex areas like bumper-to-bumper truck repair and specialized logistics. Carol MacIntyre drives the company's forward-looking strategy, ensuring sustained competitive advantage and market relevance.

    Dianah Bogan - Chief Human Resources Officer

    Dianah Bogan, the Chief Human Resources Officer at W.W. Williams, leads all human capital strategies and organizational development for the industrial power products sales and service network. Bogan oversees talent acquisition, employee relations, and compensation and benefits programs, ensuring a skilled and motivated workforce supports the company's extensive service and repair operations. This role is critical in fostering a culture that aligns with the company's mission to provide exceptional service for diesel engines, transmissions, and power generation systems. The Chief Human Resources Officer develops and implements HR policies that support operational excellence in areas like bumper-to-bumper truck repair and transport refrigeration. Bogan also champions initiatives that enhance employee engagement and professional growth, vital for retaining expertise in specialized fields such as supply chain logistics. Dianah Bogan ensures that W.W. Williams attracts and retains top talent necessary for serving on-highway truck fleets and off-highway equipment users.

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    Frequently Asked Questions Regarding W.W. Williams Top Executives and Leadership Team

    Who leads W.W. Williams?
    W.W. Williams is led by John Simmons (Chairman & Chief Executive Officer), along with executives such as Jason Onsen (Chief Financial Officer) and Bill Van Ess (President).
    Who is part of W.W. Williams’s executive team?
    The executive team of W.W. Williams includes leaders such as John Simmons (Chairman & Chief Executive Officer), Jason Onsen (Chief Financial Officer), Bill Van Ess (President) and other senior executives.
    How many executives does W.W. Williams have?
    W.W. Williams has 5 executives leading key business areas.
    What roles are included in W.W. Williams’s leadership team?
    The leadership team of W.W. Williams includes roles such as Chairman & Chief Executive Officer, Chief Financial Officer, President, President, Chief Human Resources Officer.