ATCO Executive and Leadership Team

May, 2026

Leadership Overview

ATCO has 10 executives leading key functions including strategy, technology, finance, and operations.

Driven by a commitment to operational excellence, ATCO delivers comprehensive solutions across diverse sectors, focusing on reliability and innovation in challenging environments worldwide.

Leadership Roles at ATCO

  • Chief Executive Officer & Chair - Nancy Southern
  • Chief Financial Officer - John Stamopoulos
  • Group Chief Financial Officer - Tamer Mohsen
  • Chief Financial Officer, Atco Enpower - Gregory Stevenson
  • President - Alan Elwell
  • President - William Stephens
  • President, Structures - Adam Beattie
  • President - Jacquelyn Menefee
  • Chapter 103 President - Ashley Schiiler
  • Chief Technology Officer - Bonnie Yee
  • Nancy Southern - Chief Executive Officer & Chair

    Nancy Southern, the Chief Executive Officer & Chair at ATCO, directs the overarching corporate strategy and governance. Southern guides ATCO's expansion into new markets and oversees the development of innovative solutions for government, defense, and industrial clients operating in remote global locations. This leadership role involves setting the strategic vision for ATCO Frontec's diverse service offerings, including facilities management, remote workforce accommodations, and disaster response. Southern ensures alignment across all business units, driving operational efficiency and sustainable growth. The focus remains on delivering comprehensive turnkey solutions that address complex client needs in challenging environments. By championing a culture of excellence, Nancy Southern solidifies ATCO's position as a global leader in operational support services.
    Nancy Southern

    John Stamopoulos - Chief Financial Officer

    John Stamopoulos, the Chief Financial Officer at ATCO, manages the financial health and strategic fiscal planning for the organization. Stamopoulos oversees all financial operations, including budgeting, forecasting, and financial reporting, ensuring robust fiscal management across ATCO Frontec's diverse global operations. This role is critical in supporting the company's expansion and its delivery of complex services like remote workforce accommodations and disaster response solutions. Stamopoulos ensures financial compliance and optimizes resource allocation to support ATCO's mission in challenging environments. The CFO's oversight extends to financial strategies that underpin ATCO's ability to operate effectively in regions spanning the United States, Europe, and beyond. John Stamopoulos's financial acumen is vital for ATCO's sustained operational success and market competitiveness.

    Tamer Mohsen - Group Chief Financial Officer

    Tamer Mohsen, the Group Chief Financial Officer at ATCO, directs the comprehensive financial strategy and oversight for ATCO's broader group operations. Mohsen is responsible for the financial integrity and performance across all ATCO divisions, including ATCO Frontec's specialized services. This executive function involves managing group-level financial planning, investment strategies, and risk management to support global expansion and operational excellence. Mohsen ensures that financial frameworks are robust enough to handle the complexities of ATCO's diverse client base, which includes government, defense, and industrial sectors operating in remote worldwide locations. The Group CFO's leadership ensures financial stability and supports strategic decision-making for long-term growth. Tamer Mohsen's financial leadership is integral to ATCO's sustained success and global reach.

    Gregory Stevenson - Chief Financial Officer, Atco Enpower

    Gregory Stevenson, the Chief Financial Officer, Atco Enpower at ATCO, leads the financial operations and strategic fiscal direction for the Atco Enpower division. Stevenson is responsible for managing the financial performance, budgeting, and investment strategies specific to Atco Enpower's energy and utility services. This role ensures that financial resources are effectively allocated to support operational goals and growth initiatives within the energy sector. Stevenson's oversight contributes to the financial stability and efficiency of Atco Enpower's operations, which are critical for delivering reliable energy solutions. The CFO's focus includes optimizing financial processes and driving profitability within the division. Gregory Stevenson's financial leadership is key to the sustained success and strategic development of Atco Enpower.

    Alan Elwell - President

    Alan Elwell, the President at ATCO, drives strategic initiatives and operational oversight across key business segments. Elwell focuses on enhancing service delivery and expanding ATCO's market presence, particularly in areas requiring specialized operational support. This leadership role involves guiding teams to deliver comprehensive solutions, from facilities management to remote workforce accommodations, for government, defense, and commercial clients worldwide. Elwell ensures operational excellence and fosters strong client relationships, particularly in challenging and remote environments. The President's responsibilities include optimizing resource deployment and driving efficiency across various projects. Alan Elwell's leadership is instrumental in maintaining ATCO's reputation for reliability and comprehensive service delivery in demanding global locations.

    William Stephens - President

    William Stephens, the President at ATCO, directs strategic growth and operational execution for designated business units. Stephens focuses on strengthening ATCO's capabilities in delivering critical support services, including facilities management and remote camp operations, to government and industrial clients. This leadership position involves overseeing the successful implementation of complex projects in challenging and remote global settings. Stephens ensures that ATCO's operational standards meet the highest levels of efficiency and client satisfaction. The President's role includes fostering innovation and driving performance improvements across the teams managed. William Stephens's strategic oversight is crucial for expanding ATCO's footprint and reinforcing its commitment to providing reliable solutions worldwide.

    Adam Beattie - President, Structures

    Adam Beattie, the President, Structures at ATCO, leads the strategic direction and operational management of ATCO's Structures division. Beattie oversees the design, manufacturing, and deployment of modular structures and workforce accommodations for diverse clients globally. This leadership role involves driving innovation in modular construction and ensuring the delivery of high-quality, sustainable solutions for remote and challenging environments. Beattie focuses on expanding the Structures division's market reach and enhancing its capabilities in providing turnkey solutions, including lodging, catering, and facilities management for remote workforces. Adam Beattie's strategic vision guides the division's growth and its commitment to operational excellence in serving government, defense, and commercial sectors worldwide.
    Adam Beattie

    Jacquelyn Menefee - President

    Jacquelyn Menefee, the President at ATCO, spearheads strategic initiatives and operational oversight for key ATCO business units. Menefee concentrates on enhancing service delivery and expanding ATCO's capabilities in providing essential support services, such as facilities management and remote workforce accommodations, to a broad spectrum of clients. This executive function involves guiding teams to execute complex projects efficiently, particularly in demanding and geographically dispersed locations. Menefee ensures adherence to stringent operational standards and fosters client satisfaction across diverse sectors, including government and industrial operations. Jacquelyn Menefee's leadership is vital for driving operational performance and reinforcing ATCO's commitment to delivering reliable solutions globally.

    Ashley Schiiler - Chapter 103 President

    Ashley Schiiler, the Chapter 103 President at ATCO, directs the specific operational functions and strategic objectives for Chapter 103. Schiiler oversees the execution of services aligned with the chapter's mandate, ensuring efficient resource management and project completion. This leadership role involves coordinating activities to meet client requirements and uphold ATCO's standards for operational excellence, particularly within the context of specialized chapter operations. Schiiler focuses on driving performance and ensuring the successful delivery of services under the Chapter 103 designation. Ashley Schiiler's dedicated leadership ensures the effective functioning and strategic alignment of Chapter 103 within the broader ATCO organization.

    Bonnie Yee - Chief Technology Officer

    Bonnie Yee, the Chief Technology Officer at ATCO, architects the company's technological roadmap and digital transformation initiatives. Yee drives innovation across ATCO Frontec's operations, focusing on enhancing service delivery through advanced technology solutions. This leadership position involves overseeing the integration of new systems for facilities management, remote workforce camp services, and defense support. Yee ensures that ATCO leverages cutting-edge technology to improve efficiency, safety, and client satisfaction in remote and challenging operational settings worldwide. The CTO's responsibilities include evaluating emerging technologies and implementing solutions that support ATCO's global reach, from the high Arctic to international deployments. Bonnie Yee's strategic direction empowers ATCO to provide superior, technology-driven support services.

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    Frequently Asked Questions Regarding ATCO Top Executives and Leadership Team

    Who leads ATCO?
    ATCO is led by Nancy Southern (Chief Executive Officer & Chair), along with executives such as John Stamopoulos (Chief Financial Officer) and Tamer Mohsen (Group Chief Financial Officer).
    Who is part of ATCO’s executive team?
    The executive team of ATCO includes leaders such as Nancy Southern (Chief Executive Officer & Chair), John Stamopoulos (Chief Financial Officer), Tamer Mohsen (Group Chief Financial Officer) and other senior executives.
    How many executives does ATCO have?
    ATCO has 10 executives leading key business areas.
    What roles are included in ATCO’s leadership team?
    The leadership team of ATCO includes roles such as Chief Executive Officer & Chair, Chief Financial Officer, Group Chief Financial Officer, Chief Financial Officer, Atco Enpower, President.