Simulating cardiac electrophysiological function is one of the most striking examples of a successful integrative multi-scale modeling approach applied to a living system directly relevant to human disease. This presentation showcases specific examples of the state-of-the-art in cardiac integrative modeling, including 1) improving ventricular ablation procedure by using MRI reconstructed heart geometry and structure to investigate the reentrant circuits formed in the presence of an infarct scar; 2) developing a new out-of-the box high-frequency defibrillation methodology; 3) understanding the contributions of non-myocytes to cardiac function and dysfunction, and others.