David Green, MD, PhD, is Professor Emeritus in Medicine, Division of Hematology/Oncology, at Northwestern University Feinberg School of Medicine in Chicago, Illinois. He received his medical degree from Jefferson Medical College in Philadelphia, Pennsylvania and Doctorate in Biochemistry from Northwestern University, Evanston, Illinois. He is a clinician-investigator and author of more than 300 published scientific articles. His most recent book, Linked by Blood: Hemophilia and AIDS, describes the AIDS epidemic in the early 1980s that ravaged the hemophilia community and led to major changes in the collection and processing of blood and blood products. He is a Master of American College of Physicians and recipient of many other awards.