Day & Zimmermann Executive and Leadership Team

July, 2026

Leadership Overview

Day & Zimmermann has 10 executives leading key functions including strategy, marketing, human resources, information technology, finance, government services, staffing, defense, and construction.

Driven by a legacy of innovation, Day & Zimmermann is dedicated to delivering essential solutions across construction, engineering, staffing, and defense, empowering leading corporations and governments worldwide with unparalleled expertise and commitment.

Leadership Roles at Day & Zimmermann

  • Chief Executive Officer - Jeffrey Williamson
  • Senior VP, Finance & Chief Financial Officer - Kathleen King
  • Senior VP, Finance & Chief Financial Officer - Joseph Ritzel
  • President, Government Services - Douglas Magee
  • President, Yoh - John Comito
  • President, Maintenance & Construction - John McCormick
  • President - American Ordance LLC - Paul Heidenreich
  • Chief Marketing Officer - Matthew Rivera
  • Senior Vice President, Human Resources, and Chief Human Resources Officer - Daniel Ross
  • Senior Vice President and Chief Information Officer - Sankara Viswanathan
  • Jeffrey Williamson - Chief Executive Officer

    Jeffrey Williamson, the Chief Executive Officer at Day & Zimmermann, directs the company's overarching strategy and operational execution. Williamson guides the organization's expansion in construction, engineering, staffing, and defense sectors, ensuring alignment with the company's long-standing commitment to its clients and stakeholders. This leadership role involves fostering innovation and driving sustainable growth across all business units. Williamson's focus remains on enhancing Day & Zimmermann's market position and delivering exceptional value to a global clientele. The Chief Executive Officer ensures that the company's diverse operations consistently meet the highest standards of quality and performance. Jeffrey Williamson's strategic vision propels the company forward, reinforcing its reputation as a trusted partner for complex projects worldwide.

    Kathleen King - Senior VP, Finance & Chief Financial Officer

    Kathleen King, the Senior VP, Finance & Chief Financial Officer at Day & Zimmermann, manages the company's financial operations and strategic fiscal planning. King oversees all financial reporting, budgeting, forecasting, and investment activities, ensuring the financial health and stability of the organization. This role is pivotal in supporting Day & Zimmermann's extensive work in construction, engineering, staffing, and defense, providing the financial framework for large-scale projects and global operations. The Chief Financial Officer guides financial strategies that optimize resource allocation and drive profitability. Kathleen King's financial acumen is essential for maintaining investor confidence and enabling sustainable growth across all business segments.

    Joseph Ritzel - Senior VP, Finance & Chief Financial Officer

    Joseph Ritzel, the Senior VP, Finance & Chief Financial Officer at Day & Zimmermann, collaborates on the company's financial strategy and operational fiscal management. Ritzel supports the oversight of financial reporting, capital allocation, and risk management, contributing to the robust financial infrastructure of Day & Zimmermann's construction, engineering, staffing, and defense divisions. This position is key to ensuring financial integrity and supporting the company's global project execution. The Chief Financial Officer works to enhance financial performance and provide strategic insights for business growth. Joseph Ritzel's contributions are integral to maintaining Day & Zimmermann's financial strength and supporting its mission to deliver critical solutions worldwide.
    Joseph Ritzel

    Douglas Magee - President, Government Services

    Douglas Magee, the President, Government Services at Day & Zimmermann, leads the company's dedicated division serving federal, state, and local government clients. Magee directs the strategic delivery of specialized solutions in areas such as defense, logistics, and infrastructure support, ensuring compliance with stringent government requirements. This leadership role is crucial for maintaining strong relationships with government agencies and expanding Day & Zimmermann's footprint in public sector contracts. The President, Government Services oversees operational excellence and client satisfaction within this vital segment. Douglas Magee's focus is on providing reliable, high-quality services that support national security and public infrastructure needs.
    Douglas Magee

    John Comito - President, Yoh

    John Comito, the President, Yoh at Day & Zimmermann, leads the company's global talent solutions division, Yoh. Comito drives the strategic direction and operational performance of Yoh, focusing on delivering innovative staffing and workforce solutions to diverse industries. This role is central to expanding Day & Zimmermann's reach in the staffing sector, connecting businesses with skilled professionals across technology, engineering, and healthcare. The President, Yoh oversees client engagement, service delivery, and market growth initiatives. John Comito's leadership ensures that Yoh provides agile and effective talent acquisition strategies, supporting clients in achieving their workforce objectives and driving business success.
    John Comito

    John McCormick - President, Maintenance & Construction

    John McCormick, the President, Maintenance & Construction at Day & Zimmermann, directs the company's extensive operations in industrial maintenance and large-scale construction projects. McCormick oversees project execution, safety protocols, and quality assurance, ensuring the successful delivery of complex infrastructure and facility solutions for major industrial clients. This leadership position is critical for maintaining Day & Zimmermann's reputation for excellence in the construction and engineering sectors. The President, Maintenance & Construction drives operational efficiency and client satisfaction, managing diverse teams and resources. John McCormick's expertise is vital in executing projects that meet rigorous industry standards and client expectations.
    John McCormick

    Paul Heidenreich - President - American Ordance LLC

    Paul Heidenreich, the President - American Ordance LLC at Day & Zimmermann, leads the company's specialized subsidiary focused on munitions and defense manufacturing. Heidenreich oversees all aspects of production, quality control, and strategic development for American Ordnance, ensuring the reliable supply of critical defense products. This role is paramount in supporting national security initiatives and maintaining Day & Zimmermann's strong presence in the defense industry. The President - American Ordance LLC drives operational excellence and innovation within the manufacturing sector. Paul Heidenreich's leadership ensures that American Ordnance meets the demanding requirements of military clients and upholds the highest standards of product integrity and performance.

    Matthew Rivera - Chief Marketing Officer

    Matthew Rivera, the Chief Marketing Officer at Day & Zimmermann, architects and executes comprehensive marketing strategies to elevate brand visibility and market penetration. Rivera oversees all aspects of brand management, digital marketing, and corporate communications, ensuring a cohesive and impactful message across diverse industries. This role is critical in communicating Day & Zimmermann's value proposition in construction, engineering, staffing, and defense solutions to a global audience. The Chief Marketing Officer drives initiatives that enhance customer engagement and support business development objectives. Matthew Rivera's leadership ensures that marketing efforts directly contribute to revenue growth and reinforce the company's position as an industry leader. By analyzing market trends and customer needs, Rivera shapes campaigns that resonate with key decision-makers.

    Daniel Ross - Senior Vice President, Human Resources, and Chief Human Resources Officer

    Daniel Ross, the Senior Vice President, Human Resources, and Chief Human Resources Officer at Day & Zimmermann, leads all human capital strategies and organizational development initiatives. Ross is responsible for talent acquisition, employee engagement, compensation and benefits, and fostering a robust company culture across Day & Zimmermann's global operations. This critical role ensures that the company attracts, retains, and develops top talent essential for delivering construction, engineering, staffing, and defense solutions. The Chief Human Resources Officer champions initiatives that promote diversity, equity, and inclusion, aligning workforce capabilities with strategic business objectives. Daniel Ross's expertise is vital in building a high-performing workforce capable of meeting the complex demands of leading corporations and governments worldwide.
    Daniel Ross

    Sankara Viswanathan - Senior Vice President and Chief Information Officer

    Sankara Viswanathan, the Senior Vice President and Chief Information Officer at Day & Zimmermann, directs the company's technology strategy and digital transformation efforts. Viswanathan oversees the development and implementation of IT infrastructure, cybersecurity measures, and data management systems that support Day & Zimmermann's diverse business operations in construction, engineering, staffing, and defense. This leadership position is crucial for ensuring operational efficiency, data security, and technological innovation across the organization. The Chief Information Officer drives initiatives to leverage technology for enhanced project delivery and client service. Sankara Viswanathan's strategic guidance ensures that Day & Zimmermann maintains a competitive technological edge, enabling seamless execution of complex projects for global clients.

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    Frequently Asked Questions Regarding Day & Zimmermann Top Executives and Leadership Team

    Who leads Day & Zimmermann?
    Day & Zimmermann is led by Jeffrey Williamson (Chief Executive Officer), along with executives such as Kathleen King (Senior VP, Finance & Chief Financial Officer) and Joseph Ritzel (Senior VP, Finance & Chief Financial Officer).
    Who is part of Day & Zimmermann’s executive team?
    The executive team of Day & Zimmermann includes leaders such as Jeffrey Williamson (Chief Executive Officer), Kathleen King (Senior VP, Finance & Chief Financial Officer), Joseph Ritzel (Senior VP, Finance & Chief Financial Officer) and other senior executives.
    How many executives does Day & Zimmermann have?
    Day & Zimmermann has 10 executives leading key business areas.
    What roles are included in Day & Zimmermann’s leadership team?
    The leadership team of Day & Zimmermann includes roles such as Chief Executive Officer, Senior VP, Finance & Chief Financial Officer, Senior VP, Finance & Chief Financial Officer, President, Government Services, President, Yoh.