Ameresco Executive and Leadership Team

July, 2026

Leadership Overview

Ameresco has 4 executives leading key functions including operations, finance, human resources, and marketing.

Driven by innovation, Ameresco is a leading cleantech integrator and renewable energy asset developer, owner and operator, delivering comprehensive energy efficiency, infrastructure upgrades, asset sustainability, and renewable energy solutions across North America and Europe.

Leadership Roles at Ameresco

  • Executive Vice President & Chief Financial Officer & Chief Accounting Officer - Mark Chiplock
  • Chief Operating Officer - Peter Christakis
  • Senior Vice President and Chief Human Resources Officer - Lenka Patten
  • Chief Marketing Officer & Senior VP - Leila Dillon
  • Mark Chiplock - Executive Vice President & Chief Financial Officer & Chief Accounting Officer

    Mark Chiplock, the Executive Vice President & Chief Financial Officer & Chief Accounting Officer at Ameresco, commands the company's financial operations and fiscal strategy. Overseeing all financial planning, accounting, and reporting functions, Chiplock ensures robust financial health and compliance across Ameresco's extensive portfolio of energy efficiency and renewable energy projects in North America and Europe. This critical role involves managing capital allocation, investor relations, and risk management to support sustainable growth and profitability. By providing strategic financial guidance, Mark Chiplock enables Ameresco to effectively finance and execute its cleantech solutions. The Executive Vice President & Chief Financial Officer & Chief Accounting Officer's rigorous financial oversight is fundamental to Ameresco's position as a leading asset developer and operator.

    Peter Christakis - Chief Operating Officer

    Peter Christakis, the Chief Operating Officer at Ameresco, directs the company's extensive operational activities and infrastructure development. Overseeing the execution of energy efficiency projects and renewable energy asset deployments across North America and Europe, Christakis ensures seamless integration of complex solutions for clients. This leadership role involves optimizing project lifecycles, managing cross-functional teams, and driving operational excellence to meet stringent sustainability targets. By focusing on scalable and efficient operational frameworks, Peter Christakis supports Ameresco's mission to deliver tangible environmental and economic benefits. The Chief Operating Officer's strategic oversight guarantees that Ameresco's asset development and operational capabilities consistently align with market demands and technological advancements in the cleantech sector.

    Lenka Patten - Senior Vice President and Chief Human Resources Officer

    Lenka Patten, the Senior Vice President and Chief Human Resources Officer at Ameresco, architects the company's human capital strategy and organizational development. Overseeing all aspects of human resources, Patten cultivates a high-performance culture that supports Ameresco's growth and innovation in the cleantech and renewable energy sectors. This executive function includes talent acquisition, employee engagement, compensation and benefits, and leadership development across North America and Europe. By fostering a supportive and dynamic work environment, Lenka Patten ensures that Ameresco attracts and retains top talent essential for delivering complex energy efficiency and sustainability solutions. The Senior Vice President and Chief Human Resources Officer's strategic initiatives are critical for aligning the workforce with the company's overarching mission and operational objectives.
    Lenka Patten

    Leila Dillon - Chief Marketing Officer & Senior VP

    Leila Dillon, the Chief Marketing Officer & Senior VP at Ameresco, drives the company's market presence and brand strategy. Overseeing all marketing initiatives, Dillon shapes Ameresco's communication of its comprehensive cleantech and renewable energy solutions to clients across North America and Europe. This leadership position involves developing go-to-market strategies, managing corporate communications, and enhancing customer engagement to highlight Ameresco's expertise in energy efficiency and asset sustainability. By articulating the value proposition of Ameresco's offerings, Leila Dillon supports business development and market expansion. The Chief Marketing Officer & Senior VP's strategic direction is vital for reinforcing Ameresco's reputation as a premier integrator and operator in the sustainable energy sector.

    Explore Leadership Teams in Electricity, Oil & Gas

    Frequently Asked Questions Regarding Ameresco Top Executives and Leadership Team

    Who leads Ameresco?
    Ameresco is led by Mark Chiplock (Executive Vice President & Chief Financial Officer & Chief Accounting Officer), along with executives such as Peter Christakis (Chief Operating Officer) and Lenka Patten (Senior Vice President and Chief Human Resources Officer).
    Who is part of Ameresco’s executive team?
    The executive team of Ameresco includes leaders such as Mark Chiplock (Executive Vice President & Chief Financial Officer & Chief Accounting Officer), Peter Christakis (Chief Operating Officer), Lenka Patten (Senior Vice President and Chief Human Resources Officer) and other senior executives.
    How many executives does Ameresco have?
    Ameresco has 4 executives leading key business areas.
    What roles are included in Ameresco’s leadership team?
    The leadership team of Ameresco includes roles such as Executive Vice President & Chief Financial Officer & Chief Accounting Officer, Chief Operating Officer, Senior Vice President and Chief Human Resources Officer, Chief Marketing Officer & Senior VP.