Post Holdings Executive and Leadership Team

May, 2026

Leadership Overview

Post Holdings has 7 executives leading key functions including finance, operations, human resources, information technology, technology, legal, and administration.

Driven by a commitment to operational excellence, Post Holdings manages a diverse portfolio of food businesses, focusing on cash flow, growth, and portfolio optimization across multiple consumer packaged goods categories.

Leadership Roles at Post Holdings

  • Chief Financial Officer & Treasurer - Matthew Mainer
  • Executive VP & Chief Operating Officer - Nicolas Catoggio
  • President, Michael Foods - Mark Westphal
  • Chief Human Resources Officer - Karen Little
  • Chief Information Officer & Senior VP - Joseph Caro
  • Chief Technology Officer & Vice President - Christopher Shepherd
  • Executive VP, General Counsel & Chief Administrative Officer - Diedre Gray
  • Matthew Mainer - Chief Financial Officer & Treasurer

    Matthew Mainer, the Chief Financial Officer & Treasurer at Post Holdings, directs all financial strategy and treasury operations. Mainer oversees capital allocation, investor relations, and financial planning and analysis, ensuring robust fiscal management across the company's diverse food businesses. This leadership role is critical for maintaining Post Holdings' focus on cash flow generation and portfolio optimization. By managing the company's financial health, Mainer supports strategic acquisitions and divestitures, driving sustainable growth. The Treasurer function ensures adequate liquidity and manages banking relationships, vital for the company's operational scale. Matthew Mainer's financial acumen underpins the company's ability to navigate market dynamics and achieve its growth objectives.

    Nicolas Catoggio - Executive VP & Chief Operating Officer

    Nicolas Catoggio, the Executive VP & Chief Operating Officer at Post Holdings, executes the company's operational strategy across its varied food business segments. Catoggio oversees the day-to-day management of operations, driving efficiency and productivity in areas such as ready-to-eat cereals, refrigerated foods, and pet food manufacturing. This role is central to achieving Post Holdings' objectives for portfolio optimization and operational excellence. By streamlining processes and enhancing supply chain management, Nicolas Catoggio ensures that each business unit operates at peak performance. The COO's oversight extends to integrating new acquisitions and managing the performance of existing brands, directly impacting the company's market position and profitability. Catoggio's leadership ensures seamless execution of the company's business model.
    Nicolas Catoggio

    Mark Westphal - President, Michael Foods

    Mark Westphal, the President, Michael Foods at Post Holdings, leads one of the company's significant business segments, focusing on refrigerated foods and egg products. Westphal drives the strategic direction and operational performance of Michael Foods, ensuring alignment with Post Holdings' broader goals of cash flow generation and portfolio optimization. This leadership role is crucial for maintaining market share and fostering innovation within the refrigerated foods category. By overseeing production, sales, and marketing efforts, Mark Westphal ensures Michael Foods contributes effectively to the company's overall success. His management focuses on enhancing product quality, expanding distribution, and meeting evolving consumer demands in the competitive food industry.

    Karen Little - Chief Human Resources Officer

    Karen Little, the Chief Human Resources Officer at Post Holdings, architects the company's human capital strategy and organizational development. Little directs talent acquisition, employee relations, compensation, and benefits programs, fostering a culture that supports Post Holdings' growth and operational goals. This executive function is essential for attracting and retaining the skilled workforce necessary to manage a diverse portfolio of food businesses. By aligning HR initiatives with the company's mission, Karen Little ensures that Post Holdings has the talent to drive innovation and maintain market leadership. The CHRO's responsibilities include developing leadership pipelines and implementing programs that enhance employee engagement and productivity across all divisions, from cereals to pet food.
    Karen Little

    Joseph Caro - Chief Information Officer & Senior VP

    Joseph Caro, the Chief Information Officer & Senior VP at Post Holdings, leads the company's information technology strategy and infrastructure. Caro oversees the development and implementation of technology solutions that support Post Holdings' diverse operations, including its ready-to-eat cereals, refrigerated foods, and foodservice segments. This critical role ensures that technology enhances operational efficiency, data security, and business intelligence across the organization. By driving digital transformation initiatives, Joseph Caro enables better decision-making and supports the company's focus on cash flow and portfolio optimization. The CIO's purview includes managing enterprise systems, cybersecurity, and leveraging data analytics to gain competitive advantages in the consumer packaged goods market.

    Christopher Shepherd - Chief Technology Officer & Vice President

    Christopher Shepherd, the Chief Technology Officer & Vice President at Post Holdings, spearheads technological innovation and product development across the company's portfolio. Shepherd directs research and development efforts, focusing on advancing product quality, sustainability, and market competitiveness for categories like ready-to-eat cereals and pet food. This leadership position is vital for maintaining Post Holdings' edge in the dynamic consumer packaged goods industry. By exploring and implementing cutting-edge technologies, Christopher Shepherd drives the creation of new products and enhances existing ones, directly contributing to the company's growth objectives. The CTO's vision guides the technological roadmap, ensuring alignment with market trends and consumer demands.

    Diedre Gray - Executive VP, General Counsel & Chief Administrative Officer

    Diedre Gray, the Executive VP, General Counsel & Chief Administrative Officer at Post Holdings, provides comprehensive legal counsel and oversees critical administrative functions. Gray directs all legal affairs, ensuring compliance with regulatory requirements across Post Holdings' diverse business units, including its foodservice and private brand operations. This multifaceted role is essential for mitigating risk and supporting strategic initiatives. The Chief Administrative Officer responsibilities encompass managing corporate governance, facilities, and ensuring smooth internal operations. By providing strategic legal guidance and managing administrative infrastructure, Diedre Gray supports the company's focus on portfolio optimization and sustainable growth, safeguarding the organization's interests.
    Diedre Gray

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    Frequently Asked Questions Regarding Post Holdings Top Executives and Leadership Team

    Who leads Post Holdings?
    Post Holdings is led by Matthew Mainer (Chief Financial Officer & Treasurer), along with executives such as Nicolas Catoggio (Executive VP & Chief Operating Officer) and Mark Westphal (President, Michael Foods).
    Who is part of Post Holdings’s executive team?
    The executive team of Post Holdings includes leaders such as Matthew Mainer (Chief Financial Officer & Treasurer), Nicolas Catoggio (Executive VP & Chief Operating Officer), Mark Westphal (President, Michael Foods) and other senior executives.
    How many executives does Post Holdings have?
    Post Holdings has 7 executives leading key business areas.
    What roles are included in Post Holdings’s leadership team?
    The leadership team of Post Holdings includes roles such as Chief Financial Officer & Treasurer, Executive VP & Chief Operating Officer, President, Michael Foods, Chief Human Resources Officer, Chief Information Officer & Senior VP.