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Meet our leaders

Our nursing leaders have dedicated their lives to the practice of nursing and are leading the way in innovative, high-quality and compassionate care. Meet some of our nursing leaders:


Sammie Mosier DHA, MA, BSN, NE-BC

Senior Vice President and Chief Nursing Executive

"My overarching goal is to partner with leadership and nurses to strengthen the quality of nursing care for all of HCA Healthcare. Our nurses are challenged with demanding tasks; we want to ensure they have all the necessary tools and resources needed to deliver excellent care to patients, advance nursing practice and pursue their professional goals.”

Sammie S. Mosier is senior vice president and chief nursing executive for Nashville, Tennessee-based HCA Healthcare, one of the nation’s leading providers of healthcare services. Dr. Mosier leads a team of nurse executives at the regional and facility level, and more than 93,000 registered nurses working in HCA Healthcare hospitals, ambulatory surgery centers and other sites of care.

Mosier joined HCA Healthcare in 1996 as a medical-surgical nurse at Frankfort Regional Medical Center in Frankfort, Kentucky. Throughout her career, Mosier has demonstrated a strong focus on advocating for nurses, driving clinical excellence and colleague engagement, and supporting the professional development of leaders at every level of the organization. She spearheaded HCA Healthcare’s Nursing Advocacy Agenda, Unit of Distinction Awards and the HCA Inspire mobile app, which recognizes and connects nurses across the enterprise.    

Most recently, Mosier served as the chief nurse executive officer for the HCA Healthcare National Group and vice president of group clinical operations in the Clinical Operations Group. Prior to this role, she served as the vice president and assistant chief nurse executive with the legacy Clinical Service Group.

Mosier earned a doctorate in healthcare administration, a master’s degree in management and leadership from Webster University, and a bachelor’s degree in nursing from McKendree University.  She is a board-certified nurse executive through the American Nurses Credentialing Center.


Jan Gannon, MSN, BSN, NE-BC, CPHQ

Chief Nurse Executive, HCA Healthcare National Group
Vice President, Group Clinical Operations

Jan Gannon is the chief nurse executive officer for the HCA Healthcare National Group and the vice president of group clinical operations in the Clinical Operations Group. As the group CNE, Jan leads all nursing, clinical leadership, operational and quality performance activities across eight divisions. 

Jan served as the chief nursing officer (CNO) of HCA Healthcare’s Chippenham Hospital in Richmond, Virginia, before becoming the Capital Division’s chief nursing executive in 2016.  Jan began her nursing career in her native Mississippi and has held a series of progressive leadership positions in nursing administration in both Birmingham and Atlanta.  Jan leads with a focus on advancing the practice of nursing and is passionate about employee engagement and patient experience. 

Jan has a master’s in nursing from the University of Alabama at Birmingham and a Bachelor of Science in Nursing (BSN) from the University of Mississippi Medical Center.  She is a board-certified nurse executive through the American Nurses Credentialing Center and is certified as a Certified Professional in Healthcare Quality by the National Association for Healthcare Quality.


Erica Rossitto, MBA/HCM, BSN, RN, NEA-BC

Chief Nurse Executive, HCA Healthcare American Group
Vice President, Group Clinical Operations

Erica Rossitto is the chief nurse executive officer for the HCA Healthcare American Group and the vice president of group clinical operations in the Clinical Operations Group. As the group CNE, Erica has responsibility for nursing clinical, leadership, operational and quality performance within the eight American Group divisions. She also oversees the clinical operations support team responsible for nursing operations as well as emergency, trauma, dialysis, transplant and surgical services clinical strategies.

Erica began her career with HCA Healthcare as a nurse at Swedish Medical Center, where she spent eight years in various staff and leadership roles, eventually progressing to the position of associate chief nursing officer. In 2007, she graduated from HCA Healthcare’s prestigious CNO Executive Development Program, and shortly thereafter was promoted to her first CNO role at North Suburban Medical Center. She also served as the CNO at The Medical Center of Aurora before being promoted to division chief nurse executive for the Continental Division, a role she held for four years. Throughout her 20-year career with HCA Healthcare, Erica has led with a passion for developing others. Her focus on advocacy for the nursing agenda has fostered cultures that support nurse retention and engagement, as well as superior patient outcomes. Her team was recognized as the No.1 large healthcare system in the country by IBM Watson Health in 2020.

Originally from Louisiana, she received her bachelor's degree in nursing from McNeese State University, with a minor in psychology. Erica also has her master of business administration with a focus in healthcare management and earned her Nurse Executive Advanced Board Certification from the American Nurses Credentialing Center. She has served on various boards, including the Colorado Organization of Nurse Leaders, The Colorado Center for Nursing Excellence and the Regis University Rueckert-Hartman College for Health Professions advisory board. Her current board service includes the HCA Healthcare Hope Fund board, The Beryl Institute Nurse Executive Council and the Institute for Healthcare Improvement Age-Friendly Health Systems Advisory Group.