Trinity Health Michigan Executive and Leadership Team

August, 2026

Leadership Overview

Trinity Health Michigan has 10 executives leading key functions including strategy, regional operations, administration, clinical leadership, financial management, and marketing.

Committed to delivering compassionate, integrated medical services across the state, Trinity Health Michigan prioritizes accessible, lifelong care through a vast network of hospitals, urgent-care facilities, and specialized treatment centers.

Leadership Roles at Trinity Health Michigan

  • Chief Executive Officer - Nancy Graebner
  • President & Chief Executive Officer, Trinity Health Michigan & Southeast Regions - Robert Casalou
  • Chief Executive Officer & Administrator - Richard Thomason
  • Trinity Health Michigan President & Chief Executive Officer - Shannon Striebich
  • Chief Financial Officer - Dudley Kirton
  • Vice President Chief Operating Officer Physician Enterprise - Bradley Whipple
  • Chief of Staff - Sajjad Saeed
  • Chief of Staff, Saint Joseph Mercy Chelsea - Stephen Wampler
  • Senior Vice President, Chief Marketing Officer - Paul Manternach
  • Vice Chief of Staff - Sangeetha Nanthabalan
  • Nancy Graebner - Chief Executive Officer

    Nancy Graebner, the Chief Executive Officer at Trinity Health Michigan, directs the overarching strategic vision for the organization. Overseeing the integration of medical services across West Michigan, the Chief Executive Officer ensures that hospitals and physician practices maintain high standards of patient care. This leadership role involves aligning clinical outcomes with the broader mission of the Catholic health system. By optimizing operational workflows, Nancy Graebner drives efficiency across the diverse network of treatment facilities. The Chief Executive Officer also manages relationships with community stakeholders to expand access to specialized services like orthopedic surgery and joint replacement. Through consistent focus on quality improvement, Graebner strengthens the market position of the organization. This executive leadership ensures that the health care delivery model remains responsive to the evolving needs of the communities served throughout the region, ultimately fostering a culture of excellence and compassionate service.

    Robert Casalou - President & Chief Executive Officer, Trinity Health Michigan & Southeast Regions

    Robert Casalou, the President & Chief Executive Officer, Trinity Health Michigan & Southeast Regions at Trinity Health Michigan, manages the complex operational landscape across multiple geographic territories. Directing the expansion of inpatient and outpatient services, the President & Chief Executive Officer, Trinity Health Michigan & Southeast Regions coordinates large-scale initiatives to enhance regional health outcomes. This role requires constant collaboration with the board to ensure financial sustainability and mission alignment. By leveraging the resources of the national Catholic health system, Robert Casalou architects robust delivery frameworks that support primary care and pharmacy services. The President & Chief Executive Officer, Trinity Health Michigan & Southeast Regions also oversees the integration of new facilities into the existing network. Through strategic oversight of regional operations, Casalou ensures that the organization provides consistent, high-quality care to diverse populations, effectively scaling the impact of the health system across the state.

    Richard Thomason - Chief Executive Officer & Administrator

    Richard Thomason, the Chief Executive Officer & Administrator at Trinity Health Michigan, manages the daily administrative functions and operational performance of specific medical facilities. Overseeing the implementation of clinical protocols, the Chief Executive Officer & Administrator ensures that patient care remains personalized and efficient. This leadership role involves managing facility-level budgets and staffing requirements to support specialized services like epilepsy treatment. By streamlining administrative processes, Richard Thomason improves the overall patient experience within the urgent-care and hospital settings. The Chief Executive Officer & Administrator also facilitates communication between medical staff and executive leadership to ensure operational goals align with the broader organizational mission. Through rigorous oversight of facility operations, Thomason maintains high standards of safety and service quality. This executive role directly supports the commitment of the organization to provide accessible, lifelong care to the communities throughout the region.

    Shannon Striebich - Trinity Health Michigan President & Chief Executive Officer

    Shannon Striebich, the Trinity Health Michigan President & Chief Executive Officer at Trinity Health Michigan, leads the strategic direction and growth of the entire organization. Overseeing the comprehensive health services portfolio, the Trinity Health Michigan President & Chief Executive Officer ensures that the mission of providing compassionate care remains central to all operations. This role involves navigating the complexities of a multi-institutional health system to drive innovation in medical delivery. By fostering partnerships with community leaders, Shannon Striebich expands the reach of the organization into new markets. The Trinity Health Michigan President & Chief Executive Officer also manages the integration of advanced technology to improve treatment options for patients. Through decisive leadership, Striebich ensures that the organization remains a trusted provider of health care across the state. This executive position focuses on long-term sustainability and the continuous improvement of the integrated managed care model.

    Dudley Kirton - Chief Financial Officer

    Dudley Kirton, the Chief Financial Officer at Trinity Health Michigan, directs the financial strategy and fiscal health of the organization. Overseeing capital investments and operational budgets, the Chief Financial Officer ensures that resources are allocated effectively to support the expansion of medical services. This leadership role involves managing the financial performance of the Trinity Health Plan of Michigan to ensure comprehensive coverage for members. By analyzing market trends and economic data, Dudley Kirton architects financial models that support the long-term viability of the health system. The Chief Financial Officer also collaborates with other executives to evaluate the feasibility of new technology and facility acquisitions. Through prudent fiscal management, Kirton secures the financial foundation necessary for the organization to continue providing high-quality care. This executive role is essential for maintaining the balance between mission-driven service delivery and the economic realities of the modern health care industry.

    Bradley Whipple - Vice President Chief Operating Officer Physician Enterprise

    Bradley Whipple, the Vice President Chief Operating Officer Physician Enterprise at Trinity Health Michigan, manages the operational performance of the physician practices across the state. Overseeing the integration of primary care and specialty services, the Vice President Chief Operating Officer Physician Enterprise ensures that medical practices operate efficiently and provide high-quality care. This role involves standardizing clinical processes to improve patient outcomes and operational productivity. By implementing new management systems, Bradley Whipple drives the growth of the physician enterprise. The Vice President Chief Operating Officer Physician Enterprise also collaborates with other leaders to ensure that physician practices are aligned with the broader goals of the health system. Through strategic oversight of the physician network, Whipple enhances the accessibility of care for patients throughout the region. This executive role is vital for maintaining the strength and reach of the medical services provided by the organization.

    Sajjad Saeed - Chief of Staff

    Sajjad Saeed, the Chief of Staff at Trinity Health Michigan, coordinates the administrative and clinical activities of the executive office. Overseeing the flow of information between the leadership team and the medical staff, the Chief of Staff ensures that strategic initiatives are executed with precision. This role involves facilitating high-level meetings and managing complex projects that impact the entire organization. By streamlining communication channels, Sajjad Saeed improves the responsiveness of the leadership team to emerging clinical needs. The Chief of Staff also supports the development of policies that govern patient care and operational standards. Through effective coordination, Saeed ensures that the executive team remains aligned on key objectives, such as the expansion of primary care services. This leadership role is critical for maintaining organizational cohesion and ensuring that the mission of the health system is reflected in every aspect of daily operations.

    Stephen Wampler - Chief of Staff, Saint Joseph Mercy Chelsea

    Stephen Wampler, the Chief of Staff, Saint Joseph Mercy Chelsea at Trinity Health Michigan, directs the clinical and administrative operations at the specific facility level. Overseeing the medical staff and ensuring compliance with quality standards, the Chief of Staff, Saint Joseph Mercy Chelsea maintains the integrity of patient care services. This role involves managing the daily interactions between physicians and the broader health system to ensure seamless service delivery. By optimizing clinical workflows, Stephen Wampler improves the efficiency of treatment processes within the facility. The Chief of Staff, Saint Joseph Mercy Chelsea also leads initiatives to enhance the patient experience through better coordination of care. Through active engagement with the medical team, Wampler ensures that the facility meets the high expectations of the community. This executive role focuses on the practical application of the organizational mission within a specific clinical environment, driving excellence in local health care delivery.

    Paul Manternach - Senior Vice President, Chief Marketing Officer

    Paul Manternach, the Senior Vice President, Chief Marketing Officer at Trinity Health Michigan, directs the brand strategy and public engagement efforts for the organization. Overseeing the communication of health services to the community, the Senior Vice President, Chief Marketing Officer ensures that patients understand the full range of care options available. This role involves developing marketing campaigns that highlight the specialized services, such as joint replacement and epilepsy treatment. By leveraging digital platforms and community outreach, Paul Manternach increases the visibility of the health system. The Senior Vice President, Chief Marketing Officer also manages the reputation of the organization by promoting its commitment to compassionate, lifelong care. Through strategic brand management, Manternach drives patient acquisition and strengthens the connection between the health system and the communities it serves. This executive role is essential for maintaining the market presence and public trust of the organization.
    Paul Manternach

    Sangeetha Nanthabalan - Vice Chief of Staff

    Sangeetha Nanthabalan, the Vice Chief of Staff at Trinity Health Michigan, supports the executive leadership in managing clinical governance and medical staff relations. Overseeing the implementation of clinical quality initiatives, the Vice Chief of Staff ensures that medical practices adhere to the highest standards of safety and efficacy. This role involves working closely with the Chief of Staff to facilitate communication and resolve operational challenges within the clinical environment. By monitoring performance metrics, Sangeetha Nanthabalan identifies opportunities for improvement in patient care delivery. The Vice Chief of Staff also assists in the development of strategic plans that guide the medical staff toward achieving organizational goals. Through dedicated support and oversight, Nanthabalan ensures that the clinical teams remain focused on providing personalized and comprehensive health services. This executive role is vital for maintaining the quality and consistency of care across the entire health system.

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    Frequently Asked Questions Regarding Trinity Health Michigan Top Executives and Leadership Team

    Who leads Trinity Health Michigan?
    Trinity Health Michigan is led by Nancy Graebner (Chief Executive Officer), along with executives such as Robert Casalou (President & Chief Executive Officer, Trinity Health Michigan & Southeast Regions) and Richard Thomason (Chief Executive Officer & Administrator).
    Who is part of Trinity Health Michigan’s executive team?
    The executive team of Trinity Health Michigan includes leaders such as Nancy Graebner (Chief Executive Officer), Robert Casalou (President & Chief Executive Officer, Trinity Health Michigan & Southeast Regions), Richard Thomason (Chief Executive Officer & Administrator) and other senior executives.
    How many executives does Trinity Health Michigan have?
    Trinity Health Michigan has 10 executives leading key business areas.
    What roles are included in Trinity Health Michigan’s leadership team?
    The leadership team of Trinity Health Michigan includes roles such as Chief Executive Officer, President & Chief Executive Officer, Trinity Health Michigan & Southeast Regions, Chief Executive Officer & Administrator, Trinity Health Michigan President & Chief Executive Officer, Chief Financial Officer.