Nexus Water Group Executive and Leadership Team

November, 2026

Leadership Overview

Nexus Water Group has 7 executives leading key functions including strategy, financial oversight, human capital, and regional infrastructure operations.

Focused on delivering essential utility services, Nexus Water Group maintains a commitment to sustainable water and wastewater infrastructure solutions across diverse North American markets.

Leadership Roles at Nexus Water Group

  • President & Chief Executive Officer - Rob MacLean
  • Chief Financial Officer - Alison Zimlich
  • BU President - Tiffany Van Horn
  • President, Canadian Utilities - Darrin Stephansonhe
  • President, Carolina Water Service, Inc, Carolina (North) - Donald Denton
  • President - Mid Atlantic Region - Nathaniel Spriggs
  • Chief Human Resources Officer - Joanne Elliott
  • Rob MacLean - President & Chief Executive Officer

    Rob MacLean, the President & Chief Executive Officer at Nexus Water Group, directs the overarching strategic vision for all water and wastewater infrastructure operations. Overseeing the entire corporate portfolio, the President & Chief Executive Officer ensures alignment between long-term capital investment and regulatory compliance standards. This leadership role involves managing complex stakeholder relationships while driving operational efficiency across the organization. By prioritizing sustainable utility management, Rob MacLean directly impacts the reliability of essential services provided to communities. MacLean maintains a focus on scaling infrastructure capabilities to meet growing demand, ensuring the company remains a leader in the private utility sector. Through rigorous oversight of executive performance and resource allocation, the President & Chief Executive Officer secures the financial and operational health of the enterprise, fostering a culture of excellence and accountability throughout the entire organization.
    Rob MacLean

    Alison Zimlich - Chief Financial Officer

    Alison Zimlich, the Chief Financial Officer at Nexus Water Group, manages the fiscal health and capital allocation strategies for the organization. Overseeing financial planning, reporting, and treasury functions, the Chief Financial Officer ensures the company maintains a robust balance sheet to support infrastructure development. This leadership role involves coordinating with the Board to optimize investment returns while mitigating risks associated with large-scale utility projects. By implementing advanced financial modeling, Alison Zimlich drives transparency and accuracy in all budgetary processes. Zimlich monitors market trends to inform strategic decision-making, ensuring the company possesses the necessary liquidity for expansion. Through the management of financial controls and audit processes, the Chief Financial Officer supports the long-term viability of the business model, providing the necessary economic foundation for the company to deliver high-quality water and wastewater services across its operational footprint.

    Tiffany Van Horn - BU President

    Tiffany Van Horn, the BU President at Nexus Water Group, directs the operational performance and service delivery for specific business units within the organization. Overseeing the day-to-day management of water and wastewater assets, the BU President ensures that all facilities meet stringent quality and safety standards. This leadership role involves coordinating with regional teams to optimize maintenance schedules and infrastructure upgrades. By streamlining operational workflows, Tiffany Van Horn drives efficiency and reduces service disruptions for customers. Van Horn monitors key performance indicators to ensure that each business unit achieves its revenue and service targets. Through the effective management of local resources and technical staff, the BU President supports the company's commitment to reliable utility provision. This role requires constant collaboration with other executive leaders to ensure that operational strategies remain consistent with the broader corporate objectives and long-term growth plans of the organization.

    Darrin Stephansonhe - President, Canadian Utilities

    Darrin Stephansonhe, the President, Canadian Utilities at Nexus Water Group, manages the expansion and operational oversight of water infrastructure assets throughout the Canadian market. Overseeing regulatory compliance and stakeholder engagement within the region, the President, Canadian Utilities ensures that all projects align with local environmental standards and community needs. This leadership role involves navigating complex jurisdictional requirements to deliver consistent utility services. By implementing localized operational strategies, Darrin Stephansonhe drives growth and service reliability across the northern territory. Stephansonhe coordinates with corporate leadership to integrate Canadian operations into the global business model, ensuring consistency in service quality. Through the management of regional teams and capital projects, the President, Canadian Utilities supports the company's mission to provide sustainable water solutions. This role focuses on building strong relationships with local authorities and customers, ensuring the company maintains a positive reputation and operational stability in the Canadian market.

    Donald Denton - President, Carolina Water Service, Inc, Carolina (North)

    Donald Denton, the President, Carolina Water Service, Inc, Carolina (North) at Nexus Water Group, directs the utility operations and infrastructure maintenance for the North Carolina region. Overseeing the delivery of water and wastewater services, the President, Carolina Water Service, Inc, Carolina (North) ensures that all local facilities operate at peak efficiency. This leadership role involves managing regional regulatory relationships and ensuring compliance with state-specific environmental mandates. By optimizing local service delivery, Donald Denton drives customer satisfaction and operational reliability. Denton coordinates with the broader corporate team to implement standardized maintenance protocols while addressing unique regional infrastructure challenges. Through the management of local personnel and capital improvement projects, the President, Carolina Water Service, Inc, Carolina (North) supports the company's overarching goal of providing essential utility services. This role requires a deep understanding of regional market dynamics and a commitment to maintaining high standards of service quality for all customers.

    Nathaniel Spriggs - President - Mid Atlantic Region

    Nathaniel Spriggs, the President - Mid Atlantic Region at Nexus Water Group, manages the strategic operations and infrastructure development across the Mid-Atlantic territory. Overseeing the performance of water and wastewater systems, the President - Mid Atlantic Region ensures that all regional assets meet performance benchmarks and safety requirements. This leadership role involves identifying growth opportunities and managing the integration of new utility projects into the existing portfolio. By driving operational improvements, Nathaniel Spriggs enhances service delivery and resource management within the region. Spriggs collaborates with corporate leadership to align regional activities with the company's long-term strategic goals. Through the effective oversight of regional teams and capital investments, the President - Mid Atlantic Region supports the company's mission to provide reliable and sustainable utility solutions. This role focuses on maintaining operational excellence and fostering strong community ties, ensuring the company remains a trusted provider of essential services throughout the Mid-Atlantic area.

    Joanne Elliott - Chief Human Resources Officer

    Joanne Elliott, the Chief Human Resources Officer at Nexus Water Group, architects the talent acquisition and organizational development strategies required to support a specialized utility workforce. Overseeing employee engagement, performance management, and corporate culture initiatives, the Chief Human Resources Officer ensures the company attracts and retains top-tier technical expertise. This leadership role involves aligning human capital strategies with the broader operational goals of the business. By fostering a safe and inclusive work environment, Joanne Elliott drives productivity and operational excellence across all regional teams. Elliott manages complex labor relations and professional development programs, ensuring the workforce remains equipped to handle evolving infrastructure challenges. Through the implementation of comprehensive compensation and benefits structures, the Chief Human Resources Officer supports the overall mission of the company, ensuring that the human element of the business remains a competitive advantage in the water and wastewater industry.

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    Frequently Asked Questions Regarding Nexus Water Group Top Executives and Leadership Team

    Who leads Nexus Water Group?
    Nexus Water Group is led by Rob MacLean (President & Chief Executive Officer), along with executives such as Alison Zimlich (Chief Financial Officer) and Tiffany Van Horn (BU President).
    Who is part of Nexus Water Group’s executive team?
    The executive team of Nexus Water Group includes leaders such as Rob MacLean (President & Chief Executive Officer), Alison Zimlich (Chief Financial Officer), Tiffany Van Horn (BU President) and other senior executives.
    How many executives does Nexus Water Group have?
    Nexus Water Group has 7 executives leading key business areas.
    What roles are included in Nexus Water Group’s leadership team?
    The leadership team of Nexus Water Group includes roles such as President & Chief Executive Officer, Chief Financial Officer, BU President, President, Canadian Utilities, President, Carolina Water Service, Inc, Carolina (North).