Hartree Partners Executive and Leadership Team

July, 2026

Leadership Overview

Hartree Partners has 4 executives leading key functions including strategy, finance, technology, and operations.

Driven by a commitment to identifying value, Hartree Partners specializes in energy commodities, anticipating market opportunities across the supply chain to deliver exceptional results in a dynamic global landscape.

Leadership Roles at Hartree Partners

  • Chief Financial Officer - Kalyan Popuri
  • Global Chief Operating Officer, Head of Trading & Asset Operations, Hartree Holdco - John Tonielli
  • Chief Technology Officer - Glenn Shaw
  • Founding Managing Director - Guy Merison
  • Kalyan Popuri - Chief Financial Officer

    Kalyan Popuri, the Chief Financial Officer at Hartree Partners, directs all financial planning, management, and reporting activities. Popuri oversees the firm's capital allocation strategies, ensuring robust financial health and supporting growth initiatives across its global operations. This role involves managing relationships with key financial stakeholders, including Oaktree Capital Management, L.P., and ensuring compliance with all regulatory requirements. The Chief Financial Officer's responsibilities extend to optimizing the firm's financial structure to maximize value in the trading and asset operations. By meticulously analyzing market trends and financial performance, Popuri drives strategic decision-making that aligns with Hartree Partners' core mission of identifying value in energy commodities. Kalyan Popuri's financial acumen is critical to navigating the complexities of the global commodities market and sustaining the firm's competitive advantage.

    John Tonielli - Global Chief Operating Officer, Head of Trading & Asset Operations, Hartree Holdco

    John Tonielli, the Global Chief Operating Officer, Head of Trading & Asset Operations, Hartree Holdco at Hartree Partners, directs the firm's extensive trading and asset management operations worldwide. Tonielli oversees the execution of commodity transactions, ensuring seamless integration between trading desks and physical asset management across energy and associated industries. This critical role involves optimizing operational workflows, managing risk exposure, and enhancing efficiency throughout the supply chain. The Global Chief Operating Officer's leadership ensures that Hartree Partners effectively identifies and capitalizes on value opportunities in the production, refinement, transportation, and consumption of tradable commodities. By driving operational excellence, John Tonielli supports the firm's strategic objectives and its reputation for anticipating market dynamics. Tonielli's deep understanding of trading and asset operations is vital to Hartree Partners' success in the global marketplace.

    Glenn Shaw - Chief Technology Officer

    Glenn Shaw, the Chief Technology Officer at Hartree Partners, architects and executes the firm's technology strategy, ensuring robust and scalable digital infrastructure. Shaw oversees the development and implementation of advanced technological solutions that support trading, asset operations, and global communication across Hartree Partners' eleven offices. This leadership position involves driving innovation in data analytics, risk management systems, and operational efficiency. The Chief Technology Officer's focus is on leveraging technology to identify and capitalize on market opportunities within the energy commodities sector. By enhancing the firm's technological capabilities, Glenn Shaw directly contributes to Hartree Partners' ability to anticipate market shifts and optimize value across the supply chain. Shaw's technical expertise is fundamental to maintaining the firm's competitive edge and operational excellence in a rapidly evolving industry.

    Guy Merison - Founding Managing Director

    Guy Merison, the Founding Managing Director at Hartree Partners, directs the firm's overarching strategic vision and operational framework. Merison's leadership guides the identification of value across the entire commodity supply chain, from production and refinement to transportation and consumption. This involves anticipating market shifts and capitalizing on opportunities where tradable commodities may be under- or over-valued. Overseeing global operations, Merison ensures the firm's eleven offices worldwide function cohesively, driving consistent performance and market leadership. The strategic direction established by Guy Merison underpins Hartree Partners' reputation as a premier merchant commodities firm, focusing intently on energy and its associated industries. This foundational role involves cultivating key partnerships and maintaining the firm's competitive edge in a complex financial environment.

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    Frequently Asked Questions Regarding Hartree Partners Top Executives and Leadership Team

    Who leads Hartree Partners?
    Hartree Partners is led by Kalyan Popuri (Chief Financial Officer), along with executives such as John Tonielli (Global Chief Operating Officer, Head of Trading & Asset Operations, Hartree Holdco) and Glenn Shaw (Chief Technology Officer).
    Who is part of Hartree Partners’s executive team?
    The executive team of Hartree Partners includes leaders such as Kalyan Popuri (Chief Financial Officer), John Tonielli (Global Chief Operating Officer, Head of Trading & Asset Operations, Hartree Holdco), Glenn Shaw (Chief Technology Officer) and other senior executives.
    How many executives does Hartree Partners have?
    Hartree Partners has 4 executives leading key business areas.
    What roles are included in Hartree Partners’s leadership team?
    The leadership team of Hartree Partners includes roles such as Chief Financial Officer, Global Chief Operating Officer, Head of Trading & Asset Operations, Hartree Holdco, Chief Technology Officer, Founding Managing Director.