Ameresco Executive and Leadership Team

October, 2026

Leadership Overview

Ameresco has 5 executives leading key functions including operations, marketing, human resources, financial strategy, and federal infrastructure development.

Focused on advancing sustainable energy solutions, Ameresco drives global decarbonization through innovative cleantech integration and renewable energy asset development across North American and European markets.

Leadership Roles at Ameresco

  • Executive VP, Chief Financial Officer & Chief Accounting Officer - Mark Chiplock
  • Chief Operating Officer - Peter Christakis
  • President, Federal Solutions, Utility Infrastructure, Data Centers & Large Energy Infrastructure - Nicole Bulgarino
  • Chief Marketing Officer & Senior VP - Leila Dillon
  • Senior Vice President and Chief Human Resources Officer - Lenka Patten
  • Mark Chiplock - Executive VP, Chief Financial Officer & Chief Accounting Officer

    Mark Chiplock, the Executive VP, Chief Financial Officer & Chief Accounting Officer at Ameresco, directs all financial planning, reporting, and capital allocation strategies. Overseeing the fiscal health of the organization, the Executive VP, Chief Financial Officer & Chief Accounting Officer ensures transparency and compliance with all regulatory standards. This leadership role involves managing investor relations and optimizing the financial structure to support the development of renewable energy assets. By maintaining rigorous accounting controls, Mark Chiplock directly impacts the company's ability to fund large-scale infrastructure projects across North America and Europe. Chiplock collaborates with the Board to provide accurate financial insights that guide strategic decision-making. Through the management of capital resources, the Executive VP, Chief Financial Officer & Chief Accounting Officer secures the financial foundation required for sustained growth in the cleantech industry. Ultimately, Chiplock ensures the company maintains a strong balance sheet while pursuing aggressive sustainability objectives.

    Peter Christakis - Chief Operating Officer

    Peter Christakis, the Chief Operating Officer at Ameresco, directs all internal business operations and project execution workflows. Overseeing the delivery of complex energy efficiency and infrastructure upgrades, the Chief Operating Officer ensures operational excellence across all regional project sites. This leadership role involves managing the integration of renewable energy assets while maintaining strict adherence to safety and performance standards. By optimizing internal processes, Peter Christakis directly impacts the scalability of the company's cleantech solutions. Christakis coordinates with the executive team to align operational capacity with the growing demand for sustainable energy infrastructure. Through rigorous oversight of project lifecycles, the Chief Operating Officer secures consistent value delivery for clients throughout North America and Europe. Ultimately, Christakis maintains the operational integrity required to support the company's position as a leading renewable energy asset developer and operator.

    Nicole Bulgarino - President, Federal Solutions, Utility Infrastructure, Data Centers & Large Energy Infrastructure

    Nicole Bulgarino, the President, Federal Solutions, Utility Infrastructure, Data Centers & Large Energy Infrastructure at Ameresco, directs the development and implementation of large-scale energy projects for government and utility clients. Overseeing the expansion of data center energy solutions, the President, Federal Solutions, Utility Infrastructure, Data Centers & Large Energy Infrastructure ensures the successful delivery of complex infrastructure upgrades. This leadership role involves managing high-stakes partnerships and navigating the regulatory requirements of federal energy contracts. By architecting scalable energy solutions, Nicole Bulgarino directly impacts the company's market share in the critical infrastructure sector. Bulgarino coordinates with technical teams to ensure project designs meet the specific sustainability needs of large-scale utility and data center operations. Through the oversight of these specialized divisions, the President, Federal Solutions, Utility Infrastructure, Data Centers & Large Energy Infrastructure secures significant revenue streams for the company. Ultimately, Bulgarino drives the strategic execution of major energy projects that define the company's impact on national energy security.

    Leila Dillon - Chief Marketing Officer & Senior VP

    Leila Dillon, the Chief Marketing Officer & Senior VP at Ameresco, architects the global brand strategy and market positioning for all cleantech services. Driving North American and European market expansion, the Chief Marketing Officer & Senior VP executes comprehensive communication campaigns that highlight the company's renewable energy expertise. This leadership role involves managing corporate identity and lead generation initiatives to support the sales pipeline for energy efficiency projects. By analyzing market trends, Leila Dillon directly impacts the visibility of the company's sustainability solutions among utility and federal clients. Dillon collaborates with the executive leadership to ensure consistent messaging across all digital and physical channels. Through strategic brand management, the Chief Marketing Officer & Senior VP strengthens the company's reputation as a premier integrator of energy infrastructure. Ultimately, Dillon secures long-term market relevance by articulating the value of complex energy solutions to diverse stakeholders.

    Lenka Patten - Senior Vice President and Chief Human Resources Officer

    Lenka Patten, the Senior Vice President and Chief Human Resources Officer at Ameresco, directs all talent acquisition, organizational development, and employee engagement initiatives. Overseeing the cultivation of a high-performance culture, the Senior Vice President and Chief Human Resources Officer ensures the company attracts top-tier engineering and project management talent. This leadership role involves designing compensation structures and professional development programs that align with the company's growth objectives in the renewable energy sector. By fostering an inclusive and innovative workplace, Lenka Patten directly impacts the retention of specialized expertise required for complex infrastructure projects. Patten coordinates with the executive team to ensure human capital strategies support the company's mission of delivering sustainable energy solutions. Through the implementation of robust HR policies, the Senior Vice President and Chief Human Resources Officer secures the organizational stability necessary for long-term success. Ultimately, Patten drives the human-centric initiatives that empower the workforce to achieve ambitious sustainability goals.
    Lenka Patten

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    Frequently Asked Questions Regarding Ameresco Top Executives and Leadership Team

    Who leads Ameresco?
    Ameresco is led by Mark Chiplock (Executive VP, Chief Financial Officer & Chief Accounting Officer), along with executives such as Peter Christakis (Chief Operating Officer) and Nicole Bulgarino (President, Federal Solutions, Utility Infrastructure, Data Centers & Large Energy Infrastructure).
    Who is part of Ameresco’s executive team?
    The executive team of Ameresco includes leaders such as Mark Chiplock (Executive VP, Chief Financial Officer & Chief Accounting Officer), Peter Christakis (Chief Operating Officer), Nicole Bulgarino (President, Federal Solutions, Utility Infrastructure, Data Centers & Large Energy Infrastructure) and other senior executives.
    How many executives does Ameresco have?
    Ameresco has 5 executives leading key business areas.
    What roles are included in Ameresco’s leadership team?
    The leadership team of Ameresco includes roles such as Executive VP, Chief Financial Officer & Chief Accounting Officer, Chief Operating Officer, President, Federal Solutions, Utility Infrastructure, Data Centers & Large Energy Infrastructure, Chief Marketing Officer & Senior VP, Senior Vice President and Chief Human Resources Officer.