Dr. Day is a professor of medicine at UCSF and the Chief Medical Officer at the Zuckerberg San Francisco General Hospital (ZSFG). His research interests center on organizational design, quality and systems improvement, and development of efficiency models for healthcare system delivery to vulnerable patient populations. Specifically, his research explores the delivery of healthcare through the endoscopy center. He is currently working on developing key innovations that can be implemented at the ZSFG endoscopy center that focus on maximizing staff and physician efficiency, improving patient access to endoscopic care, and strengthening patient and staff satisfaction. His research has spanned projects that have examined the quality of outpatient GI consultation notes, improving patient access though implementing a set of discharge criteria after endoscopy, studying the informed consent process in endoscopy education classes and improving endoscopy center operational efficiency using time and motion studies and simulation modeling.