Dr. Mark Marzinke is a professor of Pathology and Medicine at the Johns Hopkins University School of Medicine and co-principal investigator of the HPTN LC. He is a board-certified clinical chemist and CLIA director of the Clinical Pharmacology Analytical Laboratory within the Division of Clinical Pharmacology. He is also the director of the Automated Chemistry Laboratory at the Johns Hopkins Hospital. Dr. Marzinke leads the HPTN LC’s Pharmacology Core and directs the Clinical Laboratory Core for the Johns Hopkins Center for AIDS Research.