Kathryn Tristan is a Research Scientist and Assistant Professor of Medicine on the faculty of Washington University School of Medicine. She studies our biological immune system and its diseases. She also is interested in the “psychological immune system” that represents our constellation of thoughts and feelings meant to protect us. www.whyworrybook.com

Saul J. Weiner, MD is a professor of medicine, pediatrics, and medical education at the University of Illinois at Chicago,  the deputy director of the Veterans Health Administration's Center of Innovation for Complex Chronic Healthcare, and the cofounder of the Institute for Practice and Provider Performance Improvement (I3PI). He is the coauthor of Listening for What Matters: Avoiding Contextual Errors in Health Care. http://www.contextualizingcare.org