Edward R. Rensimer, MD, FACP is a board-certified specialist in Internal Medicine and Infectious Diseases with over 50-years experience in both outpatient and inpatient medicine. This experience has included on-call duties for internal medicine call for multiple emergency departments over his entire career to keep engaged with the knowledge base of Internal Medicine, as well as to remain skilled at real-time, critical decision-making. Therefore, practice has an unique capability for applying rapid, appropriate intervention and comprehensive care to multisystem, complex and high-criticality cases, often having defied solution by others. Essential to his professional style, philosophy, and effectiveness, he critically examines and tests prior diagnostic labels for validity and rebuilds the case from the ground-up, reflexively deferring to no one.