Executive Team

Jeff EllerJeff Eller, MBA, FACHE
President and CEO of the Northern California Network of Adventist Health

Jeff Eller is President of the Northern California Network (NCN) of Adventist Health, which includes Adventist Health Howard Memorial, St. Helena Hospital Center for Behavioral Health, Adventist Health Clear Lake, Adventist Health St. Helena and Adventist Health Ukiah Valley.

Before taking his position as President of the NCN, Eller served as President and Chief Executive Officer of Sonora Regional Medical Center—now known as Adventist Health Sonora (AHSR)—in Sonora, California, which operates a non-profit 152-bed medical center. Eller has been involved with Adventist Health since 1987, and has been in his current position since February 2014.

During his five-year tenure at Adventist Health Sonora, Eller expanded healthcare services in Tuolumne and Calaveras Counties to benefit these communities. He opened ten additional network medical offices with 22 new physicians and 3 mid-levels and a second retail pharmacy and a pediatric medical office to serve Medi-Cal patients, added Hospice Services and acquired an Ambulatory Surgery Center, invested in the latest imaging technology which, included the purchase of Phillips BrightView XCT, opened the Live Well Be Well Center, established the Center for Joint Replacement and Women's Breast Health Center in Sonora.

He expanded services in Calaveras County with the opening of Angels Camp Prompt Care, Angels Camp Physical Therapy, and Angels Camp Orthopedics. In addition, Eller led in acquiring the property adjacent to the medical center with plans to construct a 65,000 square foot medical pavilion to meet the community's growing health care needs. He also significantly improved quality core measure results as SRMC was recognized as one of the nation's Top Performers on Key Quality Measures by The Joint Commission, earning a spot among the top 18 percent of medical centers nationwide. The National Research Corporation recognized SRMC with an award for performance in the Value- Based Purchasing program. Patient, physician, and employee satisfaction scores have also improved significantly.

Prior to assuming his current duties, Eller served as Vice President for Glendale Adventist Medical Center—now known as Adventist Health Glendale—in Glendale, California. In addition, he served as Executive Director of Diagnostic and Support Services, San Joaquin Community Hospital—now known as Adventist Health Bakersfield—in Bakersfield, California, and held a variety of administrative positions at Shawnee Mission Medical Center in Kansas and Kettering Medical Center in Ohio.

Eller is a Fellow in the American College of Healthcare Executives (FACHE). A graduate of California State University, he received his M.B.A. with an emphasis in Human Resources. He also holds a B.S. from Loma Linda University. He is currently on the Board of Directors for the Tuolumne County Business Council and a member of the California Hospital Association's Rural Health Advisory Board. Eller and his wife, DeeAnna, have two adult sons.

Eller's vision for NCN and its partner organizations is to develop a culture that implements evidence-based leadership practices that will create an excellent place for employees to work, an excellent place for physicians to practice medicine, and an excellent place for our patients to receive care.

David SantosDavid Santos
President & CEO, Adventist Health Clear Lake

David Santos was appointed President and Chief Executive Officer of Adventist Health Clear Lake (AHCL) in May 2014. Santos joined the leadership team at AHCL in 2011 as Vice President of Operations, responsible for all operations of the 25-bed medical center and its multiple affiliated medical offices in Lake County. During his tenure, the hospital has experienced remarkable growth in patient visits, staff, employee engagement, provider recruitment and financial health. As CEO, Santos has led an expansion of service lines and clinics, including the innovative Live Well Program in Clearlake and the Konocti Wellness Center, a collaborative effort between Adventist Health Clear Lake and the Konocti Unified School District that features a clinic located on the campus of Lower Lake High School.

Santos has an extensive healthcare background. Prior to joining AHCL he served as Chief Operating Officer of Adventist Health’s California Medical Group, where he strengthened operations and significantly expanded the group’s size. Other experience includes positions in physician services within Adventist Health’s Central California Network; physician practice management at Mount Sinai Medical Center in Manhattan; and business development assignments at Central Texas Medical Center, a 178-bed facility near San Antonio, and within Florida Hospital Memorial Medical Centers’ 300-bed, 3 hospital system.

Santos is known for his leadership skills, visionary nature and unparalleled drive to serve his community. He and his wife, Denise, live in Lake County and have two teenage children.

Colleen AssavapisitkulColleen Assavapisitkul, RN, BSPA, HACP
Vice President of Patient Care, Adventist Health Clear Lake

Colleen Assavapisitkul was appointed to Vice President of Patient Care in 2016. In the role, she provides vision and administrative accountability in the areas of clinical quality and patient experience. Assavapisitkul’s leadership at Adventist Health Clear Lake began in 2011 when she joined the organization as Director of Quality/Infection Control. She served as Administrative Director of Patient Care before being promoted to Chief Nursing Officer in 2014. During her time with the hospital, Assavapisitkul was instrumental in opening the new Emergency Department, improving quality scores and building a strong clinical team focused on providing excellent care. Assavapisitkul’s career in healthcare includes broad experience in a number of clinical settings, including service in Hawaii, Oregon, Washington and Bangkok, Thailand.

Carlton JacobsonCarlton Jacobson
Regional Vice President of Finance, Adventist Health Clear Lake

Carlton Jacobson has served as Adventist Health Clear Lake’s Vice President of Finance since 2012. Jacobson was born in Subic Bay, Philippines and grew up in South Lancaster, Mass. Jacobson received a bachelor of science degree in business administration and a bachelor of science degree in computer science at Pacific Union College. Early professional experience includes positions in the accounting and business fields, laboratories, nursing homes and retirement centers. He began his career in hospital finance as Controller with Valley Community Hospital, a 70-bed acute care medical center in Santa Maria, Calif. In 1993, he became Controller with Adventist Health Simi Valley and Health Care Services, a 225-bed acute facility.

In 2000, Jacobson relocated to Northern California, where he assumed the position of Chief Financial Officer and Vice President of Finance with Adventist Health Howard Memorial, a 25-bed critical access medical center in Willits, Calif. During Jacobson’s tenure at AHHM, the medical center quadrupled net revenue, eliminated all debt and set aside $30 million through operations, which enabled a significant down payment for a new medical center (which was completed in November 2015). Jacobson also collaborated with the executive team at AHHM for the successful transition—the first in Adventist Health—to a Critical Access Hospital Medicare designation. In 2012, he was assigned the added responsibility of financial oversight of Adventist Health Clear Lake operations. In 2013, Jacobson assumed the role of Regional CFO for the three medical centers within the St. Helena region. He dedicated sole focus to the Clearlake, Calif., facility and its network of clinics in January 2015.