UES Executive and Leadership Team

July, 2026

Leadership Overview

UES has 7 executives leading key functions including strategy, operations, finance, and regional management.

Driven by innovation, UES delivers technology-driven solutions for sustainable infrastructure, supporting projects from development to redevelopment across diverse sectors and combining expertise in environmental and earth sciences with engineering to foster resilient and efficient infrastructure.

Leadership Roles at UES

  • Chief Executive Officer - David Witsken
  • Chief Financial Officer, Southeast - Clint Johnson
  • Chief Financial Officer, Texas & Midwest Regions - Kevin Ertel
  • Chief Operating Officer - Travis Merrick
  • President & Senior Environmental Engineer - Thomas Lao
  • Regional President - Mark Clatt
  • President - Isidro Fernandez-Aballi
  • David Witsken - Chief Executive Officer

    David Witsken, the Chief Executive Officer at UES, directs the company's overall strategy and operational execution. Witsken guides UES in providing personalized environmental, testing, inspection, and geophysical services, ensuring technology-driven solutions for sustainable infrastructure development. Overseeing all major initiatives, the Chief Executive Officer focuses on enhancing client support across transportation, water, power, healthcare, education, and industrial sectors. This leadership role involves integrating environmental and earth sciences expertise with innovative engineering to build resilient and efficient infrastructure. David Witsken drives the company's market position by fostering a culture of technical excellence and client-centric service delivery. The Chief Executive Officer's purview includes long-term growth planning and ensuring the company's continued impact on infrastructure projects nationwide.
    David Witsken

    Clint Johnson - Chief Financial Officer, Southeast

    Clint Johnson, the Chief Financial Officer, Southeast at UES, directs financial strategy and management for the Southeast region. Johnson oversees all fiscal operations, including budgeting, forecasting, and financial reporting, ensuring robust financial health for regional projects. The Chief Financial Officer, Southeast manages investment strategies and financial planning to support UES's growth in key markets. Clint Johnson's role involves optimizing financial performance and ensuring compliance with regional financial regulations. This executive position requires close collaboration with regional leadership to align financial objectives with operational expansion. The Chief Financial Officer, Southeast is critical in driving profitability and financial stability for the company's operations within the specified geographic area.

    Kevin Ertel - Chief Financial Officer, Texas & Midwest Regions

    Kevin Ertel, the Chief Financial Officer, Texas & Midwest Regions at UES, leads financial operations and strategic planning for these key territories. Ertel is responsible for financial oversight, including P&L management, capital allocation, and risk assessment, supporting UES's infrastructure development projects. The Chief Financial Officer, Texas & Midwest Regions ensures financial discipline and drives initiatives to enhance revenue and operational efficiency across the designated areas. Kevin Ertel's expertise supports the company's mission of delivering technology-driven solutions by providing sound financial guidance. This executive role is pivotal in maintaining financial integrity and fostering sustainable growth within the Texas and Midwest markets. The Chief Financial Officer, Texas & Midwest Regions collaborates with divisional leaders to achieve financial targets.

    Travis Merrick - Chief Operating Officer

    Travis Merrick, the Chief Operating Officer at UES, manages the day-to-day operations and service delivery across all business units. Merrick ensures the efficient execution of environmental, testing, inspection, and geophysical services, aligning operational processes with the company's strategic goals. The Chief Operating Officer oversees the integration of technology-driven solutions that support sustainable infrastructure projects from inception through completion. Travis Merrick focuses on optimizing resource allocation and enhancing operational workflows to meet client demands in sectors such as transportation, water, and power. This executive role involves driving operational improvements and ensuring seamless collaboration between different service lines. The Chief Operating Officer's responsibilities extend to maintaining high standards of quality and safety in all project executions.

    Thomas Lao - President & Senior Environmental Engineer

    Thomas Lao, the President & Senior Environmental Engineer at UES, provides executive leadership and deep technical expertise in environmental engineering. Lao guides the company's approach to environmental consulting services, ensuring innovative solutions for sustainable infrastructure projects. The President & Senior Environmental Engineer oversees the technical integrity of environmental assessments and remediation strategies, supporting clients across various sectors. Thomas Lao's dual role emphasizes a commitment to both strategic direction and hands-on engineering excellence. This leadership position is crucial for maintaining UES's reputation in environmental sciences and driving project success. The President & Senior Environmental Engineer champions the integration of cutting-edge engineering practices to address complex infrastructure challenges.
    Thomas Lao

    Mark Clatt - Regional President

    Mark Clatt, the Regional President at UES, directs strategic growth and operational oversight for a specific geographic region. Clatt ensures the effective delivery of UES's comprehensive engineering and consulting services, including environmental, testing, and inspection solutions. The Regional President focuses on expanding market presence and strengthening client relationships within the assigned territories. Mark Clatt's leadership is instrumental in aligning regional operations with the company's broader objectives for sustainable infrastructure development. This executive role involves managing regional teams and driving business performance. The Regional President plays a key part in UES's mission to provide resilient and efficient infrastructure solutions nationwide.

    Isidro Fernandez-Aballi - President

    Isidro Fernandez-Aballi, the President at UES, leads strategic initiatives and operational excellence across key business functions. Fernandez-Aballi drives the company's commitment to delivering technology-driven solutions for sustainable infrastructure, ensuring projects meet rigorous standards. The President oversees the integration of environmental, testing, inspection, and geophysical services to support clients in sectors like transportation and healthcare. Isidro Fernandez-Aballi's leadership focuses on fostering innovation and enhancing the company's capacity to build resilient infrastructure. This executive position is vital for guiding UES's market strategy and operational execution. The President champions the company's expertise in earth sciences and engineering to achieve client objectives.

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    Frequently Asked Questions Regarding UES Top Executives and Leadership Team

    Who leads UES?
    UES is led by David Witsken (Chief Executive Officer), along with executives such as Clint Johnson (Chief Financial Officer, Southeast) and Kevin Ertel (Chief Financial Officer, Texas & Midwest Regions).
    Who is part of UES’s executive team?
    The executive team of UES includes leaders such as David Witsken (Chief Executive Officer), Clint Johnson (Chief Financial Officer, Southeast), Kevin Ertel (Chief Financial Officer, Texas & Midwest Regions) and other senior executives.
    How many executives does UES have?
    UES has 7 executives leading key business areas.
    What roles are included in UES’s leadership team?
    The leadership team of UES includes roles such as Chief Executive Officer, Chief Financial Officer, Southeast, Chief Financial Officer, Texas & Midwest Regions, Chief Operating Officer, President & Senior Environmental Engineer.