SEH Executive and Leadership Team

June, 2026

Leadership Overview

SEH has 7 executives leading key functions including strategy, operations, technology, human resources, and design-build.

Driven by a commitment to client success, SEH leverages deep expertise across engineering, architecture, planning, and science to deliver impactful solutions in water, wastewater, buildings, infrastructure, environmental, energy, and transportation markets.

Leadership Roles at SEH

  • Chief Executive Officer - Dominic Cavagnuolo
  • Chief Executive Officer & President - David Ott
  • President - Sandra Harrilal
  • President, Seh Design Build Inc - Steven Peterson
  • President - Sam Claassen
  • Chief Information Officer & Principal - William Kloster
  • Chief People Officer - Jackie Zamorano
  • Dominic Cavagnuolo - Chief Executive Officer

    Dominic Cavagnuolo, the Chief Executive Officer at SEH, directs the company's overarching strategic vision and operational execution. Cavagnuolo guides the firm's expansion across diverse markets, including water, wastewater, buildings, infrastructure, environmental, energy, and transportation. This leadership role involves fostering innovation and ensuring the delivery of high-quality professional services by engineers, architects, planners, and scientists. By aligning departmental objectives with the company's mission, Dominic Cavagnuolo drives sustainable growth and enhances SEH's market position. The focus remains on client satisfaction and the development of robust solutions that address complex challenges in the public and private sectors. Cavagnuolo's strategic direction ensures SEH maintains its reputation for excellence and employee ownership.

    David Ott - Chief Executive Officer & President

    David Ott, the Chief Executive Officer & President at SEH, spearheads the company's strategic direction and operational leadership. Ott oversees the integration of engineering, architecture, planning, and scientific services to meet the needs of government, industrial, and commercial clients. This executive position involves driving business development and ensuring the successful execution of projects within the water, wastewater, buildings, infrastructure, environmental, energy, and transportation sectors. By fostering a culture of collaboration and technical excellence, David Ott ensures SEH delivers innovative and reliable solutions. The leadership of Ott is critical in navigating market dynamics and expanding the firm's reach across North America. Ott's commitment to employee ownership reinforces the company's dedication to long-term client partnerships and service quality.

    Sandra Harrilal - President

    Sandra Harrilal, the President at SEH, drives strategic initiatives and operational excellence across key business units. Harrilal focuses on enhancing client relationships and expanding market reach within the engineering, architecture, planning, and science sectors. This executive role involves overseeing the delivery of comprehensive services for government, industrial, and commercial clients, particularly in the water, wastewater, buildings, infrastructure, environmental, energy, and transportation markets. By fostering collaboration and innovation, Sandra Harrilal ensures SEH consistently provides high-value solutions. The leadership of Harrilal is instrumental in guiding the company's growth trajectory and reinforcing its commitment to employee ownership. Harrilal's strategic oversight supports the development of sustainable projects and strengthens SEH's reputation for technical proficiency and client-centric service.

    Steven Peterson - President, Seh Design Build Inc

    Steven Peterson, the President, Seh Design Build Inc at SEH, leads the integrated design-build division, driving project execution and client satisfaction. Peterson oversees the seamless collaboration between design and construction teams, ensuring efficient delivery of complex projects. This leadership role focuses on optimizing processes within the water, wastewater, buildings, infrastructure, environmental, energy, and transportation sectors. By championing innovative construction methodologies, Steven Peterson enhances project outcomes and cost-effectiveness for clients. The strategic direction provided by Peterson is crucial for SEH's ability to offer comprehensive, end-to-end solutions. Peterson's expertise in design-build operations directly contributes to SEH's market leadership and its capacity to undertake challenging infrastructure and development initiatives.

    Sam Claassen - President

    Sam Claassen, the President at SEH, directs strategic operations and business development initiatives across the firm. Claassen focuses on strengthening SEH's market presence by enhancing the delivery of engineering, architecture, planning, and science services. This executive position involves guiding teams to serve government, industrial, and commercial clients effectively, particularly within the water, wastewater, buildings, infrastructure, environmental, energy, and transportation sectors. By promoting a culture of innovation and client focus, Sam Claassen ensures SEH provides impactful and sustainable solutions. The leadership of Claassen is key to navigating industry challenges and expanding the company's service offerings. Claassen's strategic vision supports SEH's commitment to employee ownership and its mission to deliver exceptional value.

    William Kloster - Chief Information Officer & Principal

    William Kloster, the Chief Information Officer & Principal at SEH, architects the company's technology strategy and digital infrastructure. Kloster oversees the implementation of advanced IT solutions that support SEH's diverse professional services, including engineering, architecture, planning, and science. This critical role ensures the seamless operation of systems supporting clients in water, wastewater, buildings, infrastructure, environmental, energy, and transportation markets. By driving technological innovation, William Kloster enhances operational efficiency and data security across the organization. The leadership of Kloster is vital in leveraging digital tools to improve project delivery and client engagement. By optimizing technology resources, William Kloster directly contributes to SEH's ability to provide cutting-edge solutions and maintain its competitive edge in the professional services industry.

    Jackie Zamorano - Chief People Officer

    Jackie Zamorano, the Chief People Officer at SEH, directs the company's human capital strategy and organizational development. Zamorano oversees all aspects of employee experience, talent acquisition, and retention, fostering a robust culture aligned with SEH's employee-owned model. This leadership position is crucial for supporting the firm's engineers, architects, planners, and scientists across its diverse service areas. By championing initiatives that promote professional growth and well-being, Jackie Zamorano ensures SEH attracts and retains top talent. The strategic focus of Zamorano is on building a high-performing workforce capable of delivering exceptional service to clients in the water, wastewater, buildings, infrastructure, environmental, energy, and transportation sectors. Zamorano's efforts cultivate an environment where expertise thrives and employee engagement drives company success.

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    Frequently Asked Questions Regarding SEH Top Executives and Leadership Team

    Who leads SEH?
    SEH is led by Dominic Cavagnuolo (Chief Executive Officer), along with executives such as David Ott (Chief Executive Officer & President) and Sandra Harrilal (President).
    Who is part of SEH’s executive team?
    The executive team of SEH includes leaders such as Dominic Cavagnuolo (Chief Executive Officer), David Ott (Chief Executive Officer & President), Sandra Harrilal (President) and other senior executives.
    How many executives does SEH have?
    SEH has 7 executives leading key business areas.
    What roles are included in SEH’s leadership team?
    The leadership team of SEH includes roles such as Chief Executive Officer, Chief Executive Officer & President, President, President, Seh Design Build Inc, President.