Executive Team

Terry Newmyer, CEO President of St. Helena Region

In February 2009, Terry Newmyer became President and CEO of the St. Helena region of Adventist Health. The region includes, as flagship, the St. Helena Hospital Napa Valley and its sister facilities, the St. Helena Hospital Center for Behavioral Health in Vallejo and St. Helena Hospital Clearlake in Lake County.

Terry is a long time marketer and strategist. He comes from Florida Hospital in Orlando, the largest acute-care hospital in the nation. As Senior Vice President and Chief Development Officer, he led a $100 million fundraising campaign and secured alliances valued at over $90 million with companies such as Walt Disney World, GE, Philips, and Nike.

He has an MBA from Andrews University with a marketing emphasis. His career highlights also include Senior Vice President of Lakeland Regional Health System in Michigan and National Strategy Partner for KPMG Peat Marwick in Dallas.

Steven Herber, MD, FACS, Senior Vice President of Medical Affairs

Steven Herber, MD, FACS, is recognized as one of California’s leading instructors and practitioners in progressive plastic and aesthetic surgery techniques. In addition to his role at St. Helena Hospital, Herber, a board-certified plastic surgeon, is medical director of the St. Helena Institute for Plastic Surgery.

 Herber earned a bachelor of science degree from Pacific Union College in Angwin, California, and a medical degree from Loma Linda University School of Medicine. He completed a general surgery residency at Loma Linda University Medical Center and a plastic surgery residency at Yale University, as well as a fellowship in maxillofacial and pediatric plastic surgery at Akron Children’s Hospital Medical Center in Akron, Ohio.

The American Medical Association has recognized Herber for his volunteer work on behalf of impoverished children around the world.

Edward “Buck” McDonald

Senior Vice President of Finance and Operations

Buck McDonald oversees the financial operations of St. Helena Hospital Napa Valley, St. Helena Hospital Clear Lake and St. Helena Center for Behavioral Health. He also serves as chief financial officer of the St. Helena Hospital Foundation and California Medical Group, a position he has held since 1989.

Previously, McDonald worked with Adventist Medical Center in Portland, Oregon, and Adventist Health’s corporate office in Roseville, California. He holds a bachelor of science degree in business administration from Walla Walla University in Walla Walla, Washington, as well as a CPA license.

McDonald lives in Angwin with his wife, Tami, and has two adult sons, Michael and Jeffrey.

Joshua R. Cowan, MBA,  Regional Vice President of Marketing

Joshua Cowan joined St. Helena in September 2009 as director of client services, leading a team of sales and service advisors in a variety of consumer relations activities, including promoting St. Helena’s destination health care services. Previously, he served as director of donor relations for the Florida Hospital Foundation based in Orlando, Florida. In that capacity, Cowan directed a team of researchers, donor service representatives and solicitors in support of the foundation and its major gifts program. 

Cowan holds a master of business administration degree from Webster University in Orlando, Florida, and a bachelor of arts degree in media arts from Emerson College in Boston.  

Orvin Fillman, DrPH,
Regional Vice President of Behavioral Medicine

Before joining St. Helena Hospital, Orvin Fillman, MHA, DrPH, worked with The Fox Group, LLC, as a consultant to the health care industry. He spent the previous 10 years in Honolulu, Hawaii, with the state department of health and The Queen’s Medical Center.

Nia Lendaris, RN, CNS,  Regional Vice President of Patient Care

Nia Lendaris is the patient care executive responsible for  all aspects of the patient experience, including safety, quality of care, satisfaction and improved outcomes.

Lendaris is known in the region as a nursing educator, cardiac rehab manager and patient experience advocate, as well as for her work managing the databases of the American College of Cardiology and Society of Thoracic Surgeons to identify opportunities to improve patient care. She began her career at Sharp Memorial Hospital in San Diego and Queen of the Valley Medical Center in Napa.

David Santos, Vice President of Operations

St. Helena Hospital Clear Lake

David Santos has an extensive background in health care, including serving as chief operating officer of Adventist Health’s California Medical Group, where he strengthened operations and significantly expanded the group’s size.

Previously, Santos worked in physician services at Adventist Health hospitals in Hanford, California. He has also served in physician practice management at Mount Sinai Medical Center in New York City and has held management assignments at Central Texas Medical Center and Florida Hospital Ormond Memorial. Throughout his career, Santos has worked to support compliance, business development, marketing and philanthropy.

Tricia Williams, Vice President of Operations and Planning

St. Helena Hospital Napa Valley

Tricia Williams is responsible for St. Helena’s business planning and development, as well as operational service line management, support services, and facility and construction management. 

Williams, who has more than 20 years of experience in the health care industry, began working with St. Helena in 2006 as vice president of business development and marketing. She has also held leadership positions with Valley Health System, Quest Systems and Transamerica Financial Services. 

Williams earned a bachelor of science degree in business administration from Loma Linda University.