Dr. Marzinke is an Assistant Professor of Pathology and Medicine in the Johns Hopkins University School of Medicine. He is the Director of Preanalytics and General Chemistry areas of the Core Laboratories of the Johns Hopkins Hospital and the Associate Director of the Clinical Pharmacology Analytical Laboratory in the Division of Clinical Pharmacology. Dr. Marzinke is board certified in Clinical Chemistry by the American Board of Clinical Chemistry. His primary research focuses are in the method development and validation of mass spectrometric assays for the quantification of anti-retrovirals and other anti-infectives in a variety of biological matrices. Dr. Marzinke is a principal investigator or co-investigator on several NIH-funded grants, and has published more than 20 peer-reviewed manuscripts or book chapters.