Mark A. Musen, MD, PhD, is Professor of Medicine at Stanford University, where he is Director of the Stanford Center for Biomedical Informatics Research. Dr. Musen studies intelligent systems, reusable ontologies, and biomedical decision support. He chairs the Health Informatics and Modeling Topic Advisory Group for the World Health Organization‚Äôs revision of the International Classification of Diseases (ICD-11). Dr. Musen is the principal investigator of the National Center for Biomedical Ontology and of the Center for Expanded Data Annotation and Retrieval (CEDAR). CEDAR is an NIH Big Data to Knowledge center of excellence that seeks to develop new technologies to aid investigators in the authoring and management of metadata regarding biomedical experiments.