HSS Executive and Leadership Team

May, 2026

Leadership Overview

HSS has 10 executives leading key functions including strategy, operations, finance, and medical affairs.

Driven by a steadfast commitment to excellence in education, HSS is the preeminent musculoskeletal hospital in the world, transforming patient care through innovation and tradition.

Leadership Roles at HSS

  • Chief Executive Officer - Meshesha Ceo
  • Executive Administrator & Office of The President & Chief Executive Officer - Lisa Valerioti
  • Chief Executive Officer, HSS (Florida) - Tara McCoy
  • Chief Financial Officer - Mary Manwell
  • Chief Operating Officer - Caloy Penz
  • Chief Operating Officer & Executive Vice President - Mary Cassai
  • Chief Operating Officer & Executive Vice President - Mary Cassai Nea-Bc Mpa
  • Chief of Staff & Office of The Chief Data & Analytics Officer - Mary Mcmahon
  • Senior Director of Intake and Portfolio Office. Chief of Staff To the Chief Digital Strategy Officer - Melissa Litwack
  • Chief Medical Officer - Sheeraz Qureshi
  • Meshesha Ceo - Chief Executive Officer

    Meshesha Ceo, the Chief Executive Officer at HSS, directs the overall strategic vision and operational execution for the world's preeminent musculoskeletal hospital. This leadership role involves guiding the institution's transformation from its historical roots into a leading academic medical center. Ceo oversees all major departments, ensuring alignment with the mission of advancing orthopedic surgery through education and patient care. The Chief Executive Officer drives initiatives that enhance HSS's global reputation and market leadership. Meshesha Ceo's purview encompasses fostering innovation in patient treatment and surgical techniques, directly impacting the hospital's continued growth and influence in the healthcare sector. This executive ensures the hospital's long-term sustainability and its commitment to training top-tier medical professionals.

    Lisa Valerioti - Executive Administrator & Office of The President & Chief Executive Officer

    Lisa Valerioti, the Executive Administrator & Office of The President & Chief Executive Officer at HSS, provides critical administrative support and operational management for the highest levels of leadership. This role ensures the seamless functioning of the President and Chief Executive Officer's office, facilitating strategic decision-making and daily operations. Valerioti manages complex schedules, coordinates executive communications, and oversees key projects that support the hospital's mission. The Executive Administrator plays a vital part in maintaining organizational efficiency and enabling the executive team to focus on advancing HSS's position as a global leader in musculoskeletal care. Lisa Valerioti's contributions are essential to the effective governance and strategic direction of the institution.
    Lisa Valerioti

    Tara McCoy - Chief Executive Officer, HSS (Florida)

    Tara McCoy, the Chief Executive Officer, HSS (Florida) at HSS, leads the strategic direction and operational management for HSS's expansion into the Florida market. This executive is responsible for establishing and growing HSS's presence, ensuring the delivery of specialized musculoskeletal care consistent with the institution's global standards. McCoy oversees all aspects of the Florida operations, from clinical services to administrative functions, driving patient access and service excellence. The Chief Executive Officer, HSS (Florida) plays a critical role in extending HSS's mission and impact beyond its traditional base. Tara McCoy's leadership is key to successfully implementing HSS's vision for nationwide leadership in orthopedic care.
    Tara McCoy

    Mary Manwell - Chief Financial Officer

    Mary Manwell, the Chief Financial Officer at HSS, directs all financial operations and strategic fiscal planning for the institution. This executive manages budgeting, financial reporting, and investment strategies to ensure the hospital's economic stability and growth. Manwell oversees the allocation of resources, supporting HSS's mission to provide advanced musculoskeletal care and maintain its leadership in medical education. The Chief Financial Officer plays a crucial role in financial oversight, ensuring compliance and driving profitability. Mary Manwell's expertise is vital for sustaining HSS's position as the preeminent musculoskeletal hospital globally and supporting its long-term vision for innovation and patient care.

    Caloy Penz - Chief Operating Officer

    Caloy Penz, the Chief Operating Officer at HSS, oversees the day-to-day operational activities that ensure the hospital's leading position in musculoskeletal care. This executive directs the implementation of strategic initiatives across various departments, focusing on efficiency and service excellence. Penz manages critical infrastructure and resource allocation, supporting the hospital's commitment to advanced patient treatment and surgical training. The Chief Operating Officer ensures that all operational processes align with HSS's mission to provide world-class orthopedic services. Caloy Penz's leadership drives continuous improvement in patient experience and clinical outcomes, reinforcing HSS's status as a premier academic medical center.

    Mary Cassai - Chief Operating Officer & Executive Vice President

    Mary Cassai, the Chief Operating Officer & Executive Vice President at HSS, directs comprehensive operational strategies and oversees major institutional initiatives. This executive leads critical functions that ensure the seamless delivery of world-class musculoskeletal care and supports the hospital's educational mission. Cassai manages extensive resources and operational frameworks, driving efficiency and excellence across all service lines. The Chief Operating Officer & Executive Vice President plays a pivotal role in institutional growth and the advancement of orthopedic surgery. Mary Cassai's leadership is instrumental in maintaining HSS's global preeminence and fostering an environment of continuous innovation in patient treatment and medical training.
    Mary Cassai

    Mary Cassai Nea-Bc Mpa - Chief Operating Officer & Executive Vice President

    Mary Cassai Nea-Bc Mpa, the Chief Operating Officer & Executive Vice President at HSS, drives operational excellence and strategic development across key hospital functions. This executive manages complex operational frameworks, ensuring the highest standards of patient care and clinical outcomes in musculoskeletal medicine. Cassai Nea-Bc Mpa oversees significant institutional projects and resource management, supporting HSS's commitment to education and research. The Chief Operating Officer & Executive Vice President is central to advancing the hospital's mission and expanding its influence. Mary Cassai Nea-Bc Mpa's leadership ensures the efficient and effective delivery of specialized orthopedic services, reinforcing HSS's global reputation.

    Mary Mcmahon - Chief of Staff & Office of The Chief Data & Analytics Officer

    Mary Mcmahon, the Chief of Staff & Office of The Chief Data & Analytics Officer at HSS, provides strategic support and operational coordination for data-driven initiatives. This role ensures the effective implementation of analytics strategies across the hospital, enhancing patient care and operational efficiency. Mcmahon works closely with the Chief Data & Analytics Officer to translate data insights into actionable strategies that advance HSS's mission. The Chief of Staff facilitates cross-departmental collaboration, driving innovation in how data informs decision-making. Mary Mcmahon's contributions are key to leveraging advanced analytics for maintaining HSS's leadership in musculoskeletal medicine and education.

    Melissa Litwack - Senior Director of Intake and Portfolio Office. Chief of Staff To the Chief Digital Strategy Officer

    Melissa Litwack, the Senior Director of Intake and Portfolio Office. Chief of Staff To the Chief Digital Strategy Officer at HSS, manages critical intake processes and portfolio oversight, directly supporting digital strategy implementation. This role ensures efficient patient access and effective management of digital initiatives that enhance HSS's patient care and operational capabilities. Litwack collaborates closely with the Chief Digital Strategy Officer to align portfolio objectives with the hospital's overarching mission. The Senior Director of Intake and Portfolio Office facilitates the strategic deployment of digital solutions. Melissa Litwack's contributions are vital for optimizing patient journeys and advancing HSS's digital transformation in musculoskeletal medicine.

    Sheeraz Qureshi - Chief Medical Officer

    Sheeraz Qureshi, the Chief Medical Officer at HSS, directs clinical strategy and medical affairs, ensuring the highest standards of patient care and physician development. This executive oversees all medical staff, clinical departments, and research initiatives, reinforcing HSS's position as a world leader in musculoskeletal health. Qureshi drives innovation in medical practice and patient treatment, aligning clinical operations with the hospital's educational mission. The Chief Medical Officer plays a crucial role in maintaining clinical excellence and advancing orthopedic surgery. Sheeraz Qureshi's leadership ensures that HSS continues to set benchmarks in patient outcomes and medical education globally.
    Sheeraz Qureshi

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    Frequently Asked Questions Regarding HSS Top Executives and Leadership Team

    Who leads HSS?
    HSS is led by Meshesha Ceo (Chief Executive Officer), along with executives such as Lisa Valerioti (Executive Administrator & Office of The President & Chief Executive Officer) and Tara McCoy (Chief Executive Officer, HSS (Florida)).
    Who is part of HSS’s executive team?
    The executive team of HSS includes leaders such as Meshesha Ceo (Chief Executive Officer), Lisa Valerioti (Executive Administrator & Office of The President & Chief Executive Officer), Tara McCoy (Chief Executive Officer, HSS (Florida)) and other senior executives.
    How many executives does HSS have?
    HSS has 10 executives leading key business areas.
    What roles are included in HSS’s leadership team?
    The leadership team of HSS includes roles such as Chief Executive Officer, Executive Administrator & Office of The President & Chief Executive Officer, Chief Executive Officer, HSS (Florida), Chief Financial Officer, Chief Operating Officer.