Thornton Tomasetti Executive and Leadership Team

July, 2026

Leadership Overview

Thornton Tomasetti has 5 executives leading key functions including strategy, finance, technology, and information systems.

Driven by a commitment to engineering excellence, Thornton Tomasetti provides comprehensive design, investigation, and analysis services to a global clientele, shaping projects of all scales with innovative structural solutions.

Leadership Roles at Thornton Tomasetti

  • Co-Chief Executive Officer - Peter DiMaggio
  • Co-Chief Executive Officer - Michael Squarzini
  • Chief Financial Officer - Rimma Zaleznik
  • Chief Technology Officer - Robert Otani
  • Chief Information Officer - Jim Dray
  • Peter DiMaggio - Co-Chief Executive Officer

    Peter DiMaggio, the Co-Chief Executive Officer at Thornton Tomasetti, directs the firm's global strategy and operational execution. Overseeing all business units, DiMaggio ensures the delivery of high-quality engineering design, investigation, and analysis services to clients worldwide. This leadership role involves fostering innovation across project types, from small-scale investigations to large, complex global developments. By aligning departmental objectives with the company's core mission, Peter DiMaggio drives sustainable growth and enhances the firm's market position. The Co-Chief Executive Officer's focus remains on expanding the firm's reach and impact within the construction and architecture industries, ensuring operational efficiency and client satisfaction across all engagements.
    Peter DiMaggio

    Michael Squarzini - Co-Chief Executive Officer

    Michael Squarzini, the Co-Chief Executive Officer at Thornton Tomasetti, spearheads the firm's strategic vision and client engagement initiatives. Squarzini guides the company's approach to complex engineering challenges, ensuring that Thornton Tomasetti consistently provides innovative design, investigation, and analysis services. This executive function involves cultivating strong client relationships and identifying new opportunities for service expansion across diverse project scales. By championing a culture of technical excellence, Michael Squarzini reinforces the firm's reputation for delivering impactful solutions globally. The Co-Chief Executive Officer's leadership ensures that the company's services meet the evolving demands of the construction and architecture sectors, driving forward the firm's commitment to engineering integrity and client success.
    Michael Squarzini

    Rimma Zaleznik - Chief Financial Officer

    Rimma Zaleznik, the Chief Financial Officer at Thornton Tomasetti, manages the company's financial health and strategic fiscal planning. Zaleznik oversees all financial operations, including budgeting, forecasting, and investment strategies, ensuring the firm's economic stability and profitability. This critical role involves optimizing financial performance to support the delivery of engineering design, investigation, and analysis services worldwide. By implementing robust financial controls and driving fiscal discipline, Rimma Zaleznik enables Thornton Tomasetti to undertake projects of varying sizes and complexities. The Chief Financial Officer's expertise is essential for guiding the company's financial direction and securing resources for future growth and innovation in the global market.

    Robert Otani - Chief Technology Officer

    Robert Otani, the Chief Technology Officer at Thornton Tomasetti, directs the company's technological advancements and digital transformation efforts. Otani is responsible for developing and implementing innovative technology strategies that enhance the firm's engineering design, investigation, and analysis capabilities. This executive position involves exploring and integrating cutting-edge tools and platforms to improve project delivery efficiency and client outcomes across global projects. By championing technological innovation, Robert Otani ensures Thornton Tomasetti remains at the forefront of the industry. The Chief Technology Officer's vision drives the adoption of advanced digital solutions, supporting the company's mission to provide world-class engineering services and maintain a competitive edge in the market.

    Jim Dray - Chief Information Officer

    Jim Dray, the Chief Information Officer at Thornton Tomasetti, oversees the company's information technology infrastructure and systems. Dray manages the strategic planning and execution of IT operations, ensuring secure, reliable, and efficient technology solutions support the firm's global engineering design, investigation, and analysis services. This leadership function involves safeguarding company data, optimizing network performance, and implementing digital tools that enhance collaboration and productivity for all employees. By driving advancements in IT, Jim Dray ensures that Thornton Tomasetti's technological backbone is robust and scalable, supporting the firm's commitment to delivering exceptional client service worldwide. The Chief Information Officer's role is pivotal in maintaining operational continuity and fostering a secure digital environment.

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    Frequently Asked Questions Regarding Thornton Tomasetti Top Executives and Leadership Team

    Who leads Thornton Tomasetti?
    Thornton Tomasetti is led by Peter DiMaggio (Co-Chief Executive Officer), along with executives such as Michael Squarzini (Co-Chief Executive Officer) and Rimma Zaleznik (Chief Financial Officer).
    Who is part of Thornton Tomasetti’s executive team?
    The executive team of Thornton Tomasetti includes leaders such as Peter DiMaggio (Co-Chief Executive Officer), Michael Squarzini (Co-Chief Executive Officer), Rimma Zaleznik (Chief Financial Officer) and other senior executives.
    How many executives does Thornton Tomasetti have?
    Thornton Tomasetti has 5 executives leading key business areas.
    What roles are included in Thornton Tomasetti’s leadership team?
    The leadership team of Thornton Tomasetti includes roles such as Co-Chief Executive Officer, Co-Chief Executive Officer, Chief Financial Officer, Chief Technology Officer, Chief Information Officer.