On-Call List
Physician Privileges
Safety Data Sheets (SDS)
Workplace Violence Reporting
On-Call List
Physician Privileges
Safety Data Sheets (SDS)
Workplace Violence Reporting
Contact Administration
Charles “Chad” Harris, MD
Ex-officio Member | Interim Chief Executive Officer
Dr. Chad Harris is the Interim CEO at Natividad. He has served as Chief Medical Officer – Quality Assurance at Natividad, Chief Medical Information Officer and Chief of Staff. He is a family medicine hospitalist and an HIV clinic provider. Dr. Harris is board certified by both the American Board of Family Medicine and the American Board of Preventive Medicine in Clinical Informatics. He received his medical degree from the Medical College of Virginia/Virginia Commonwealth University and completed his family medicine internship and residency at Contra Costa Regional Medical Center.
Craig A. Walls, MD, Ph.D
Chief Medical Officer
Dr. Craig A. Walls is the Chief Medical Officer at Natividad. His previous roles at Natividad were Medical Director of the Emergency Department, attending Emergency Physician, and Vice-Chief of the Medical Staff. Dr. Walls has worked as an emergency physician at various hospitals, including Dominican Hospital in Santa Cruz, California, MacNeal Hospital in Chicago, Illinois, and St. Mary Medical Center in Hobart, Indiana. His experience in academia includes teaching and research while serving as an Assistant Clinical Professor at the University of California, San Francisco and Visiting Assistant Professor of Community Health at the University of Illinois, Champaign, Illinois. He completed a residency in Emergency Medicine at Johns Hopkins Hospital, and received a Medical Degree at the University of Illinois at Urbana-Champaign, Illinois and a Ph.D. in Community Health at the University of Illinois at Urbana-Champaign, Illinois. Dr. Walls is certified by the American Board of Emergency Medicine. Dr. Walls is a member of the Monterey County Medical Society Board of Directors and the Natividad Medical Foundation Board of Directors.
Daniel Leon
Chief Financial Officer
Daniel Leon, a senior financial management expert with more than 20 years of experience in the health care sector, is chief financial officer for Natividad. Mr. Leon is responsible for all Natividad’s financial services, including strategic financial and capital planning, procurement and supply management, revenue cycle programs for physicians and hospital, debt management, rate setting and reimbursement, and financial planning. Prior to joining Natividad, Mr. Leon served as chief financial officer for for-profit hospitals and non-for-profit hospitals. Mr. Leon has also served as the financial and operations executive for a comprehensive oncology health system and successfully lead a financial turnaround for a stand-alone hospital.
Ari Entin
Chief Information Officer
Ari Entin is the hospital’s Chief Information Officer. He comes to Natividad with 20 years of healthcare IT leadership experience in areas of public health and disease management. Prior to joining Natividad, Mr. Entin led the IT efforts of the Miami-Dade County Health Department as well as Quality Oncology in Sunrise, Florida. He has also served as an adjunct faculty member in the Florida International University’s College of Business Administration- Master of Health Informatics Management program and Barry University’s Master of Health Services Administration program. Mr. Entin has earned both his Bachelor and Master degree in Health Service Administration from Florida International University in Miami, Florida.
Nancy Buscher
Chief Nursing Officer
A native of Michigan, Buscher received her doctorate in Nursing Leadership from Rush University in Chicago, Illinois. She also received a master's degree in Nursing Administration from Andrews University in Berrien Springs, Michigan, and a bachelor's degree in nursing from Nazareth College in Kalamazoo, Michigan. Prior to Natividad, Buscher served for thirteen years as CNO/Vice President of Patient Care at Three Rivers Health in Three Rivers, Michigan. She was Interim Director of Telemetry and IMCU at Methodist Specialty and Transplant Hospital in San Antonio, Texas, and Interim Director of multiple units at Good Samaritan Hospital in San Jose, California. Buscher was also a member of the Adjunct Faculty in the Doctorate of Healthcare Administration at the University of Phoenix in Phoenix, Arizona for almost five years.
Andrea Rosenberg
Assistant Administrator Operations & Support Services
Andrea Rosenberg is the Assistant Administrator for Operations and Support Services after serving in various leadership roles at the Hospital since 2004. Prior to joining Natividad’s staff, Ms. Rosenberg filled key administrative leadership roles for The Women’s Hospital of Texas in Houston as well as Bayshore in Pasadena, Texas. Ms. Rosenberg earned both a Bachelor of Science in Cellular and Molecular Biology and a Master of Health Administration from Tulane University in New Orleans, Louisiana.
Janine Bouyea
Hospital Human Resources Administrator
Janine Bouyea is responsible for all aspects of the Human Resources Department, Hospital Education, Employee Health and oversight of the Volunteer Auxiliary. She began her career with the County of Monterey in the Human Resources Department of the County Administrative Office. She then transferred to Natividad to take on the role of Personnel Analyst were she quickly moved on to the position of Associate Personnel Analyst before being promoted to her current role as Hospital Human Resources Administrator. She earned a Master of Arts in Human Resources from Golden Gate University and a Bachelor of Arts from San Jose State University.