Dr. Marzinke received his PhD in Biochemistry at the University of Wisconsin-Madison in 2010. He completed a fellowship in Clinical Chemistry at the Johns Hopkins University School of Medicine in July 2012. He is currently the Director of Preanalytics at the Johns Hopkins Hospital and is the Associate Director of the Clinical Pharmacology Analytical Lab at the Johns Hopkins University School of Medicine. Dr. Marzinke is a diplomate of the American Board of Clinical Chemistry.