Dr Kendal Williams MD MPH is a professor of clinical medicine at the Perelman School of Medicine, University of Pennsylvania. He has had a varied career in which he has been both a primary care physician and a hospitalist, and was the inpatient service chief for Penn Presbyterian Medical Center for nearly 10 years. He also was the founding director of the Penn Center of Evidence-based Practice. He has consistently taught evidence-based medicine, clinical research interpretation, health care systems, and more recently teaches point of care ultrasound as part of his practice. Currently, he does both primary care and hospitalist duties at Penn.