Zinnia Executive and Leadership Team

June, 2026

Leadership Overview

Zinnia has 5 executives leading key functions including strategy, operations, human resources, and chief of staff roles.

Driven by innovation, Zinnia is dedicated to advancing healthcare and wellness through technology, focusing on enhancing patient care and operational efficiency across the sector.

Leadership Roles at Zinnia

  • Founder & Chief Executive Officer - Eldana Sime
  • Chief of Staff - Callie Thomas
  • Chief Human Resources Officer - Elaine Page
  • Operations Chief of Staff - Gregory Heinen
  • Director, Chief of Staff - David Siebold
  • Eldana Sime - Founder & Chief Executive Officer

    Eldana Sime, the Founder & Chief Executive Officer at Zinnia, directs the overarching strategy and vision for the company's innovative solutions in healthcare and wellness. Sime architects the business's approach to enhancing patient care and driving operational efficiency within the sector. This leadership involves setting the strategic direction for product development and market expansion, ensuring Zinnia remains at the forefront of technological advancement in health tech. The Founder & Chief Executive Officer's responsibilities extend to fostering key partnerships and guiding the executive team toward achieving ambitious growth targets. By championing a culture of innovation, Eldana Sime ensures the company consistently delivers impactful solutions that address critical needs in patient care and operational workflows. The strategic decisions made by Sime directly influence Zinnia's market position and long-term sustainability, solidifying the company's commitment to transforming the healthcare landscape.

    Callie Thomas - Chief of Staff

    Callie Thomas, the Chief of Staff at Zinnia, executes critical strategic initiatives and operational improvements across the organization. Thomas ensures seamless coordination between departments, facilitating the implementation of Zinnia's core mission to enhance patient care and operational efficiency in healthcare and wellness. This role involves managing key projects, optimizing internal processes, and serving as a central point of communication for the executive leadership. The Chief of Staff's focus is on driving execution excellence and ensuring alignment with the company's strategic objectives. By streamlining operations and fostering cross-functional collaboration, Callie Thomas directly supports the company's growth and its commitment to delivering innovative health tech solutions. Thomas's efforts are vital in translating strategic vision into tangible operational outcomes, reinforcing Zinnia's impact in the healthcare sector.

    Elaine Page - Chief Human Resources Officer

    Elaine Page, the Chief Human Resources Officer at Zinnia, shapes the company's talent strategy and cultivates a high-performance culture essential for innovation in healthcare and wellness. Page oversees all human resources functions, including talent acquisition, employee development, and organizational design, ensuring Zinnia attracts and retains top talent critical for enhancing patient care and operational efficiency. This leadership role involves developing programs that support employee well-being and professional growth, aligning human capital with the company's strategic goals. The Chief Human Resources Officer's expertise is crucial in building a cohesive and motivated workforce capable of driving Zinnia's mission forward. By fostering an environment that values collaboration and continuous learning, Elaine Page directly contributes to the company's ability to deliver cutting-edge health tech solutions and maintain its competitive edge in the market.
    Elaine Page

    Gregory Heinen - Operations Chief of Staff

    Gregory Heinen, the Operations Chief of Staff at Zinnia, spearheads operational excellence and process optimization to support the company's mission in healthcare and wellness. Heinen focuses on enhancing the efficiency of Zinnia's internal operations, directly impacting the delivery of innovative solutions that improve patient care. This role involves managing complex operational projects, identifying areas for improvement, and implementing best practices across various departments. The Operations Chief of Staff's responsibilities are critical for ensuring seamless execution of Zinnia's strategic initiatives and maintaining high standards of service delivery. By driving operational improvements and fostering a culture of accountability, Gregory Heinen ensures that Zinnia can effectively scale its offerings and meet the evolving demands of the healthcare technology market. Heinen's work is fundamental to the company's ability to achieve its goals in patient care and operational efficiency.

    David Siebold - Director, Chief of Staff

    David Siebold, the Director, Chief of Staff at Zinnia, supports the strategic execution and operational alignment critical to Zinnia's advancements in healthcare and wellness technology. Siebold collaborates closely with the executive team to drive key projects forward, ensuring that initiatives aimed at enhancing patient care and operational efficiency are implemented effectively. This position involves facilitating communication, managing cross-functional workflows, and contributing to strategic planning processes. The Director, Chief of Staff's role is integral to maintaining organizational momentum and ensuring that Zinnia's operational framework supports its innovative solutions. By providing dedicated support to leadership and overseeing critical operational tasks, David Siebold directly contributes to the company's capacity to achieve its ambitious objectives in the health tech sector. Siebold's contributions are essential for translating strategic directives into actionable operational plans.

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    Frequently Asked Questions Regarding Zinnia Top Executives and Leadership Team

    Who leads Zinnia?
    Zinnia is led by Eldana Sime (Founder & Chief Executive Officer), along with executives such as Callie Thomas (Chief of Staff) and Elaine Page (Chief Human Resources Officer).
    Who is part of Zinnia’s executive team?
    The executive team of Zinnia includes leaders such as Eldana Sime (Founder & Chief Executive Officer), Callie Thomas (Chief of Staff), Elaine Page (Chief Human Resources Officer) and other senior executives.
    How many executives does Zinnia have?
    Zinnia has 5 executives leading key business areas.
    What roles are included in Zinnia’s leadership team?
    The leadership team of Zinnia includes roles such as Founder & Chief Executive Officer, Chief of Staff, Chief Human Resources Officer, Operations Chief of Staff, Director, Chief of Staff.