He currently holds the post of Director, Department of Research and Planning, Queen's Medical Center, Honolulu, Hawaii as well Associate Clinical Professor, Department of Geriatric Medicine, John A. Burns School of Medicine, University of Hawaii. Dr. Willcox is also Associate Director of Interdisciplinary Research on Aging at the Pacific Health Research Institute (PHRI) in Honolulu and Investigator, Geriatrics and Gerontology, PHRI, Kuakini Medical Center and Straub Hospital. Additionally, Dr. Willcox works as Staff Physician, Orthopedic Hospitalist Program, The Queen's Medical Center and Medical Team Care Attending Physician, John A. Burns School of Medicine, University of Hawaii and Medical Director, Willcox HealthSpan Clinic.