Thyme Care Executive and Leadership Team

November, 2026

Leadership Overview

Thyme Care has 4 executives leading key functions including strategy, operations, organizational alignment, and legal compliance.

Focused on transforming the oncology experience, Thyme Care delivers personalized navigation and virtual support to improve patient outcomes and manage healthcare costs across the United States.

Leadership Roles at Thyme Care

  • Chief Executive Officer - Brad Diephuis
  • Chief Operating Officer - Marcia Macphearson
  • Chief of Staff - Jessa Kelley
  • Chief Legal Officer - Michael Markowicz
  • Brad Diephuis - Chief Executive Officer

    Brad Diephuis, the Chief Executive Officer at Thyme Care, directs the overarching strategic vision for oncology care navigation. Overseeing the integration of virtual assistance with health plans and oncology groups, the Chief Executive Officer ensures that members receive personalized guidance throughout the cancer journey. This leadership role involves scaling the platform to enhance communication between primary care providers and specialized oncology teams. By prioritizing accessible and effective care, Diephuis drives the company mission to improve patient outcomes while managing healthcare costs. The Chief Executive Officer maintains alignment with the Board to secure long-term growth and market impact. Through constant innovation in care delivery models, Brad Diephuis fosters a culture of excellence. Ultimately, the Chief Executive Officer positions the organization as a leader in the health software industry by optimizing the entire cancer care experience for diverse patient populations.
    Brad Diephuis

    Marcia Macphearson - Chief Operating Officer

    Marcia Macphearson, the Chief Operating Officer at Thyme Care, manages the daily execution of oncology navigation services and internal operational workflows. Overseeing the deployment of virtual support teams, the Chief Operating Officer ensures that clinical resources reach patients efficiently across North American markets. This leadership role involves streamlining the coordination between oncology groups and health plans to reduce administrative friction. By refining operational processes, Macphearson improves the scalability of the care navigation platform. The Chief Operating Officer collaborates with the executive team to translate strategic goals into actionable service delivery metrics. Through rigorous oversight of operational performance, Marcia Macphearson guarantees that the company maintains high standards of care quality. Ultimately, the Chief Operating Officer stabilizes the infrastructure required to support rapid growth while ensuring that every patient interaction remains consistent, effective, and aligned with the core mission of the organization.
    Marcia Macphearson

    Jessa Kelley - Chief of Staff

    Jessa Kelley, the Chief of Staff at Thyme Care, coordinates cross-functional initiatives and manages the internal rhythm of the executive leadership team. Overseeing the alignment of organizational priorities, the Chief of Staff ensures that strategic objectives receive the necessary resources and attention. This leadership role involves facilitating communication between departments to maintain focus on the company mission of improving the cancer journey. By managing complex projects and high-level initiatives, Kelley drives operational efficiency across the entire enterprise. The Chief of Staff acts as a primary liaison for the executive office, ensuring that all business units remain synchronized with the broader corporate strategy. Through meticulous planning and execution, Jessa Kelley supports the growth of the organization. Ultimately, the Chief of Staff optimizes the internal environment to allow for seamless collaboration, enabling the company to deliver superior navigation services to patients and providers nationwide.
    Michael Markowicz, the Chief Legal Officer at Thyme Care, manages all regulatory compliance, contractual partnerships, and risk mitigation strategies. Overseeing the legal framework for virtual oncology navigation, the Chief Legal Officer ensures that all operations adhere to healthcare privacy standards and industry regulations. This leadership role involves negotiating complex agreements with health plans and oncology groups to facilitate seamless care coordination. By providing legal guidance on product development and market expansion, Markowicz protects the intellectual property and operational integrity of the company. The Chief Legal Officer collaborates with the executive team to navigate the evolving landscape of health software and patient data security. Through proactive legal strategy, Michael Markowicz supports the sustainable growth of the organization. Ultimately, the Chief Legal Officer secures the foundation of the business, allowing the company to focus on delivering accessible and effective cancer care solutions to patients across the country.
    Michael Markowicz

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    Frequently Asked Questions Regarding Thyme Care Top Executives and Leadership Team

    Who leads Thyme Care?
    Thyme Care is led by Brad Diephuis (Chief Executive Officer), along with executives such as Marcia Macphearson (Chief Operating Officer) and Jessa Kelley (Chief of Staff).
    Who is part of Thyme Care’s executive team?
    The executive team of Thyme Care includes leaders such as Brad Diephuis (Chief Executive Officer), Marcia Macphearson (Chief Operating Officer), Jessa Kelley (Chief of Staff) and other senior executives.
    How many executives does Thyme Care have?
    Thyme Care has 4 executives leading key business areas.
    What roles are included in Thyme Care’s leadership team?
    The leadership team of Thyme Care includes roles such as Chief Executive Officer, Chief Operating Officer, Chief of Staff, Chief Legal Officer.