David Rosenblatt is Professor of Biology, Human Genetics, Medicine and Pediatrics, McGill University. He is a world authority in the area of inherited disorders of the vitamins folic acid and cobalamin (vitamin B12). His laboratory is the world reference centre for the diagnosis of these disorders and also has been responsible for the characterization of a number of these diseases and for the cloning of the responsible genes. This has allowed for proper diagnosis, carrier detection, and prenatal diagnosis. He also established the first Division of Medical Genetics in a Department of Medicine in Canada.