John P. Ansah is an Assistant Professor in the Signature Programme in Health Services and Systems Research, Duke-NUS and a faculty fellow at Residential College 4, National University of Singapore. He has a Ph.D. in Systems Science methodology of System Dynamics, and has 10 years’ experience in the application of simulation modeling to complex health policy issues. A/Professor Ansah’s research uses computational modeling—with systems thinking and System Dynamics methodology as the foundation—coupled with the active involvement of stakeholders to better understand complex health systems issues to inform policy and interventions to improve health outcomes. His research interests lie broadly in the area of health systems improvement—to address strategic and operational health and social care challenges – and the evaluation of health system-wide impacts of complex health and social care interventions. Current projects include long-term care needs, resilience and hip fracture recovery trajectories among the elderly, patients flow in the emergency department, enhanced primary care for an ageing society and human resources for health.