Thyme Care Executive and Leadership Team

October, 2026

Leadership Overview

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

Dedicated to transforming the oncology experience, Thyme Care provides 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 strategy 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 operations to enhance communication between primary care providers and oncology teams, ultimately driving better clinical outcomes. By focusing on the accessibility of care, Brad Diephuis aligns the company mission with the practical needs of patients navigating complex healthcare systems. Diephuis manages the expansion of these coordinated solutions across North American markets, ensuring that the organization remains at the forefront of effective cancer care delivery. Through constant evaluation of healthcare cost management, the Chief Executive Officer maintains the financial and operational health of the enterprise while fostering a culture of patient-centered innovation.
    Brad Diephuis

    Marcia Macphearson - Chief Operating Officer

    Marcia Macphearson, the Chief Operating Officer at Thyme Care, manages the daily delivery of oncology navigation services and clinical operations. Overseeing the deployment of experienced oncology teams, the Chief Operating Officer ensures that virtual assistance reaches members effectively to improve care coordination. This leadership role involves refining the operational model to enhance communication between oncology groups and primary care providers. By optimizing service delivery, Marcia Macphearson directly impacts the quality of support provided to patients during the cancer journey. Macphearson monitors performance metrics to ensure that the company meets its goals for accessibility and cost management. Through the implementation of scalable operational frameworks, the Chief Operating Officer supports the expansion of services across regional markets. Macphearson maintains a focus on operational excellence, ensuring that the organization consistently delivers high-quality, personalized guidance that improves patient outcomes and strengthens partnerships with health plans.
    Marcia Macphearson

    Jessa Kelley - Chief of Staff

    Jessa Kelley, the Chief of Staff at Thyme Care, coordinates internal operations and cross-functional initiatives to support the oncology navigation mission. Managing the alignment of executive priorities, the Chief of Staff facilitates communication between departments to ensure that virtual assistance programs function seamlessly. This role involves optimizing internal workflows to improve the efficiency of oncology teams providing personalized support to members. By streamlining organizational processes, Jessa Kelley enables the company to scale its impact across diverse healthcare partnerships. Kelley monitors the execution of strategic goals, ensuring that every initiative directly contributes to the improvement of the cancer journey for patients. Through rigorous oversight of operational projects, the Chief of Staff maintains the focus on delivering accessible and effective care solutions. Kelley drives the internal rhythm of the organization, ensuring that all teams remain synchronized in the pursuit of enhanced patient outcomes and reduced healthcare costs.
    Michael Markowicz, the Chief Legal Officer at Thyme Care, directs all legal, regulatory, and compliance strategies for the oncology navigation platform. Overseeing the complex landscape of healthcare regulations, the Chief Legal Officer ensures that all virtual assistance programs and partnerships with oncology groups adhere to industry standards. This role involves mitigating risk while enabling the company to innovate within the cancer care space. By providing legal guidance on data privacy and healthcare delivery, Michael Markowicz protects the integrity of the patient-centered mission. Markowicz manages contractual relationships with health plans and providers, ensuring that all agreements support the goal of accessible and effective care. Through proactive legal strategy, the Chief Legal Officer facilitates the growth of the organization while maintaining strict compliance with national healthcare laws. Markowicz secures the operational foundation of the company, allowing the team to focus on improving outcomes and managing costs for members.
    Michael Markowicz

    Explore Leadership Teams in Healthcare Software

    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.