Zinnia Executive and Leadership Team

October, 2026

Leadership Overview

Zinnia has 8 executives leading key functions including strategy, operational coordination, financial management, technology development, human resources, and organizational alignment.

Committed to advancing healthcare outcomes, Zinnia delivers innovative software solutions designed to optimize patient care and streamline complex wellness operations across global markets.

Leadership Roles at Zinnia

  • Founder & Chief Executive Officer - Eldana Sime
  • Chief Financial Officer - Kihara Kiarie
  • Chief of Staff - Callie Thomas
  • Chief Technology Officer - Bradley Medd
  • Chief Human Resources Officer - Elaine Page
  • Director, Chief of Staff - David Siebold
  • Operations Chief of Staff - Gregory Heinen
  • Chief People Officer, Se2 - Errol Williams
  • Eldana Sime - Founder & Chief Executive Officer

    Eldana Sime, the Founder & Chief Executive Officer at Zinnia, directs the overarching strategic vision for the organization. By prioritizing the integration of advanced software within healthcare ecosystems, Sime drives the company toward enhanced patient care and superior operational efficiency. This leadership role involves constant collaboration with the Board to ensure long-term growth and market relevance. Eldana Sime maintains a focus on scaling wellness technology to meet the evolving demands of the modern medical landscape. Through the implementation of robust business models, the Founder & Chief Executive Officer secures the competitive position of the firm. By fostering a culture of innovation, the executive ensures that all departments remain aligned with the core mission of improving health outcomes. Ultimately, the Founder & Chief Executive Officer oversees the expansion of market reach while maintaining high standards of service delivery across all healthcare sectors.

    Kihara Kiarie - Chief Financial Officer

    Kihara Kiarie, the Chief Financial Officer at Zinnia, oversees the fiscal health and long-term economic strategy of the organization. By managing capital allocation and financial planning, Kiarie ensures that the company maintains the resources required for continuous innovation in healthcare software. The Chief Financial Officer directs all budgeting processes and financial reporting to provide transparency for stakeholders. Kihara Kiarie monitors market trends to identify opportunities for sustainable growth and revenue optimization. This leadership role involves working closely with the executive team to evaluate the financial viability of new wellness technology initiatives. By maintaining rigorous fiscal discipline, the Chief Financial Officer supports the overall stability of the firm. Through the analysis of complex data sets, the executive informs strategic decisions that impact the bottom line. Ultimately, the Chief Financial Officer secures the financial future of the company by balancing investment in development with operational efficiency.

    Callie Thomas - Chief of Staff

    Callie Thomas, the Chief of Staff at Zinnia, manages the internal administrative workflows and executive communications. By coordinating cross-departmental initiatives, the Chief of Staff ensures that strategic priorities receive the necessary resources for successful execution. Callie Thomas facilitates seamless interaction between the C-suite and various operational teams to maintain organizational agility. This role involves monitoring key performance indicators to track progress against corporate objectives. By streamlining internal processes, the Chief of Staff optimizes the efficiency of the leadership team. Thomas provides critical support in decision-making cycles, ensuring that all initiatives align with the broader goals of the company. Through the management of high-priority projects, the Chief of Staff drives operational excellence. Ultimately, the executive maintains the structural integrity of the organization by fostering clear communication channels and ensuring that all strategic directives receive consistent attention from the relevant departments.

    Bradley Medd - Chief Technology Officer

    Bradley Medd, the Chief Technology Officer at Zinnia, architects the technical infrastructure that powers the company's healthcare software solutions. By leading the engineering and development teams, Medd ensures the delivery of scalable, secure, and efficient wellness platforms. The Chief Technology Officer drives the adoption of emerging technologies to maintain a competitive edge in the digital health market. Bradley Medd collaborates with other C-suite leaders to align technical roadmaps with the broader business strategy. This role involves overseeing the entire product lifecycle, from initial design to final deployment. By prioritizing user experience and system reliability, the Chief Technology Officer enhances the value provided to patients and providers. Through the management of technical debt and innovation cycles, the executive ensures that the software remains at the forefront of the industry. Ultimately, the Chief Technology Officer secures the technological foundation necessary for the company to achieve its long-term growth objectives.

    Elaine Page - Chief Human Resources Officer

    Elaine Page, the Chief Human Resources Officer at Zinnia, directs the talent acquisition and organizational development strategies. By fostering a high-performance culture, Page ensures that the company attracts and retains the expertise required to innovate in the healthcare sector. The Chief Human Resources Officer oversees employee engagement programs and professional development initiatives to support the workforce. Elaine Page collaborates with leadership to align human capital strategies with the evolving needs of the business. This role involves managing compensation structures and performance management systems to drive productivity. By promoting diversity and inclusion, the Chief Human Resources Officer strengthens the organizational fabric. Through the implementation of effective HR policies, the executive ensures that the company remains a preferred employer in the wellness technology space. Ultimately, the Chief Human Resources Officer supports the overall mission by building a resilient and motivated team capable of achieving complex operational goals.
    Elaine Page

    David Siebold - Director, Chief of Staff

    David Siebold, the Director, Chief of Staff at Zinnia, manages the tactical execution of special projects and high-level administrative functions. By focusing on the operational efficiency of the executive office, Siebold ensures that strategic initiatives move forward without delay. The Director, Chief of Staff coordinates between various departments to resolve bottlenecks and improve internal workflows. David Siebold provides analytical support to the leadership team, enabling data-driven decision-making across the organization. This role involves overseeing the implementation of corporate policies and ensuring that all teams remain aligned with the company's mission. By facilitating effective communication, the Director, Chief of Staff maintains the momentum of critical business processes. Through the management of complex schedules and priorities, the executive optimizes the time and focus of the leadership team. Ultimately, the Director, Chief of Staff secures the operational success of the firm by ensuring that all strategic directives receive consistent and effective oversight.

    Gregory Heinen - Operations Chief of Staff

    Gregory Heinen, the Operations Chief of Staff at Zinnia, directs the logistical and operational frameworks that support the company's healthcare services. By optimizing internal processes, Heinen ensures that the organization maintains high levels of efficiency in its daily operations. The Operations Chief of Staff monitors the performance of key business units to identify areas for improvement and growth. Gregory Heinen collaborates with department heads to streamline workflows and enhance the delivery of wellness solutions. This role involves managing the integration of new operational tools and systems to support the company's scaling efforts. By focusing on process improvement, the Operations Chief of Staff drives productivity across the entire organization. Through the analysis of operational data, the executive informs strategic adjustments that improve service quality. Ultimately, the Operations Chief of Staff secures the operational foundation of the firm by ensuring that all internal systems function in harmony with the broader business strategy.

    Errol Williams - Chief People Officer, Se2

    Errol Williams, the Chief People Officer, Se2 at Zinnia, leads the human capital strategy specifically for the Se2 division. By focusing on workforce planning and organizational design, Williams ensures that the division possesses the necessary talent to meet its specific healthcare technology goals. The Chief People Officer, Se2 directs the implementation of training and development programs tailored to the needs of the technical and operational teams. Errol Williams collaborates with the broader HR leadership to ensure consistency in company culture and values. This role involves managing employee relations and performance metrics to drive excellence within the division. By fostering a collaborative environment, the Chief People Officer, Se2 supports the retention of key personnel. Through the development of effective people strategies, the executive ensures that the division remains agile and responsive to market changes. Ultimately, the Chief People Officer, Se2 secures the long-term success of the division by building a strong and capable workforce.

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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 Kihara Kiarie (Chief Financial Officer) and Callie Thomas (Chief of Staff).
    Who is part of Zinnia’s executive team?
    The executive team of Zinnia includes leaders such as Eldana Sime (Founder & Chief Executive Officer), Kihara Kiarie (Chief Financial Officer), Callie Thomas (Chief of Staff) and other senior executives.
    How many executives does Zinnia have?
    Zinnia has 8 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 Financial Officer, Chief of Staff, Chief Technology Officer, Chief Human Resources Officer.