Mark Graber MD FACP is the Chief of Medicine at the Department of Veterans Hospital, Northport, New York and Professor and Vice-Chair for Medicine at SUNY Stony Brook, NY. He is a graduate cum laude of Yale College (Molecular Biophysics and Biochemistry) and received his MD degree from Stanford University. Dr. Graber is board certified in Medicine and Nephrology. He is the past President of the Association of VA Chiefs of Medicine and currently serves as Chair of the VA Chiefs of Medicine Field Advisory Committee. Dr. Graber is a practicing nephrologist, educator, administrator, and investigator. His major research interests now center on patient safety and diagnostic errors in medicine. He has been funded by the Department of Veterans Affairs and various foundations for his research work, most recently by the National Patient Safety Foundation to study diagnostic errors in internal medicine. Dr. Graber will discuss his work on clinical diagnostic errors in the context of diagnostic error in general and laboratory diagnostic error. He is the author of 50 peer-reviewed publications. Dr. Graber actively participated in the efforts to establish Patient Safety Awareness Week in 2002, and the nations first voluntary, anonymous medical error reporting process, the VA's "Patient Safety Reporting System".