Steel Dynamics Executive and Leadership Team

June, 2026

Leadership Overview

Steel Dynamics has 8 executives leading key functions including strategy, finance, operations, administration, human resources, and information technology.

Driven by innovation, Steel Dynamics is dedicated to manufacturing steel products and providing metals recycling services, serving diverse markets with an integrated approach to production, recycling, and fabrication.

Leadership Roles at Steel Dynamics

  • Co-founder, Chairman & Chief Executive Officer - Mark Millett
  • Operations Chief Financial Officer & Director - Simon Tran
  • Executive VP & Chief Financial Officer - Theresa Wagler
  • President & Chief Operating Officer - Barry Schneider
  • President & Owner - Dana Iannalfo
  • Chief Administrative Officer (CAO) - Denis Ismaili
  • Hrd - Shawn Shi
  • Information - Mimi Johnson
  • Mark Millett - Co-founder, Chairman & Chief Executive Officer

    Mark Millett, Co-founder, Chairman & Chief Executive Officer at Steel Dynamics, directs the company's overarching strategy and corporate governance. Millett guides the integrated operations spanning steel production, recycling, and fabrication, ensuring alignment with market demands across construction, automotive, manufacturing, transportation, and agriculture equipment sectors. This leadership role involves driving the company's expansion and innovation in producing sheet steel, structural beams, rail products, engineered bars, and specialty steel sections. Millett also oversees the strategic direction of metals recycling services, processing ferrous and nonferrous scrap metals into reusable forms. The Chairman & Chief Executive Officer ensures robust financial performance and sustainable growth, solidifying Steel Dynamics' position as a leading manufacturer. Millett's vision propels the company's commitment to delivering high-quality steel building components, including joists, girders, trusses, and decks, to the construction industry.
    Mark Millett

    Simon Tran - Operations Chief Financial Officer & Director

    Simon Tran, Operations Chief Financial Officer & Director at Steel Dynamics, manages the financial operations critical to the company's extensive manufacturing and recycling activities. Tran oversees financial planning, analysis, and reporting, ensuring fiscal discipline across all business segments, including sheet steel, structural beams, and rail products production. The Operations Chief Financial Officer & Director plays a key part in optimizing the financial performance of metals recycling services, processing both ferrous and nonferrous scrap metals. Tran's responsibilities extend to the financial oversight of steel building component fabrication, such as joists, girders, trusses, and decks. By analyzing market trends and operational efficiencies, Simon Tran supports strategic decision-making to enhance profitability and drive growth in diverse sectors like construction, automotive, and transportation.

    Theresa Wagler - Executive VP & Chief Financial Officer

    Theresa Wagler, Executive VP & Chief Financial Officer at Steel Dynamics, oversees the company's comprehensive financial strategy and management. Wagler directs all aspects of financial planning, capital allocation, and investor relations, ensuring the fiscal health of operations that span steel production, metals recycling, and steel fabrication. The Executive VP & Chief Financial Officer plays a critical role in managing the financial performance of producing a wide array of steel products, including sheet steel, structural beams, and engineered bars. Wagler also guides the financial aspects of the metals recycling services, processing both ferrous and nonferrous scrap metals. Theresa Wagler's financial acumen supports strategic investments in new technologies and market expansion, reinforcing Steel Dynamics' commitment to serving the construction, automotive, and transportation industries with robust financial oversight.
    Theresa Wagler

    Barry Schneider - President & Chief Operating Officer

    Barry Schneider, President & Chief Operating Officer at Steel Dynamics, directs the company's day-to-day operational execution and strategic implementation across its integrated business units. Schneider oversees the comprehensive steel production processes, ensuring efficient manufacturing of sheet steel, structural beams, rail products, engineered bars, and specialty steel sections. The President & Chief Operating Officer also manages the extensive metals recycling operations, focusing on the effective processing of ferrous and nonferrous scrap metals. Schneider's leadership ensures the seamless fabrication of steel building components, including joists, girders, trusses, and decks, for the construction industry. By optimizing supply chains and production workflows, Barry Schneider drives operational excellence and supports the company's service to diverse markets such as automotive, manufacturing, transportation, and agriculture equipment sectors.
    Barry Schneider

    Dana Iannalfo - President & Owner

    Dana Iannalfo, President & Owner at Steel Dynamics, holds a pivotal leadership position overseeing key strategic initiatives and business development. Iannalfo drives the company's market presence and growth strategies, focusing on expanding the reach of its comprehensive steel products, including sheet steel, structural beams, and engineered bars. The President & Owner also guides the strategic direction of metals recycling services, ensuring efficient processing of ferrous and nonferrous scrap metals to support sustainable operations. Iannalfo's leadership is instrumental in the fabrication of steel building components, such as joists, girders, trusses, and decks, for the construction industry. By fostering strong client relationships and identifying new market opportunities, Dana Iannalfo contributes significantly to Steel Dynamics' success across the automotive, manufacturing, and transportation sectors.
    Dana Iannalfo

    Denis Ismaili - Chief Administrative Officer (CAO)

    Denis Ismaili, Chief Administrative Officer (CAO) at Steel Dynamics, directs the company's administrative functions and ensures efficient organizational operations. Ismaili oversees critical support services that enable the seamless execution of steel production, metals recycling, and steel fabrication activities. The Chief Administrative Officer (CAO) plays a key role in managing corporate facilities, legal affairs, and compliance, ensuring adherence to regulatory standards across all business segments. Ismaili's responsibilities include optimizing internal processes and resource allocation to support the manufacturing of sheet steel, structural beams, and rail products, as well as the processing of scrap metals. Denis Ismaili's administrative leadership ensures that Steel Dynamics operates with maximum efficiency and integrity, supporting its commitment to serving diverse markets including construction, automotive, and transportation.

    Shawn Shi - Hrd

    Shawn Shi, Hrd at Steel Dynamics, manages the human resources functions critical to supporting the company's diverse workforce across its manufacturing, recycling, and fabrication operations. Shi oversees talent acquisition, employee development, and compensation strategies, ensuring a skilled and motivated team is in place to produce high-quality steel products. The Hrd focuses on fostering a positive work environment that supports the production of sheet steel, structural beams, and rail products, as well as the processing of metals for recycling. Shi's role involves implementing HR policies that align with the company's operational goals, including the fabrication of steel building components for the construction industry. By championing employee engagement and compliance, Shawn Shi contributes to the overall efficiency and success of Steel Dynamics in serving various market sectors.

    Mimi Johnson - Information

    Mimi Johnson, Information at Steel Dynamics, oversees the critical information systems and technology infrastructure that support the company's extensive operations. Johnson manages the implementation and maintenance of IT solutions essential for steel production, including sheet steel, structural beams, and rail products manufacturing. The Information role ensures the seamless flow of data across the metals recycling services, processing both ferrous and nonferrous scrap metals, and the fabrication of steel building components for the construction industry. Johnson's responsibilities include safeguarding company data, enhancing cybersecurity measures, and driving digital transformation initiatives. By optimizing technology resources, Mimi Johnson supports operational efficiency and strategic decision-making across all market sectors served by Steel Dynamics, including automotive, manufacturing, and transportation.

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    Frequently Asked Questions Regarding Steel Dynamics Top Executives and Leadership Team

    Who leads Steel Dynamics?
    Steel Dynamics is led by Mark Millett (Co-founder, Chairman & Chief Executive Officer), along with executives such as Simon Tran (Operations Chief Financial Officer & Director) and Theresa Wagler (Executive VP & Chief Financial Officer).
    Who is part of Steel Dynamics’s executive team?
    The executive team of Steel Dynamics includes leaders such as Mark Millett (Co-founder, Chairman & Chief Executive Officer), Simon Tran (Operations Chief Financial Officer & Director), Theresa Wagler (Executive VP & Chief Financial Officer) and other senior executives.
    How many executives does Steel Dynamics have?
    Steel Dynamics has 8 executives leading key business areas.
    What roles are included in Steel Dynamics’s leadership team?
    The leadership team of Steel Dynamics includes roles such as Co-founder, Chairman & Chief Executive Officer, Operations Chief Financial Officer & Director, Executive VP & Chief Financial Officer, President & Chief Operating Officer, President & Owner.