Stephen Cederbaum is a Distinguished Professor Emeritus at UCLA Departments of Psychiatry and Biobehavioral Sciences, Pediatrics, and Human Genetics. Stephen has worked in the field of inborn errors of metabolism and newborn screening, particularly disorders of the urea cycle for more than 50 years. He has studied these disorders in patients and in animal models, using various forms of gene and mRNA therapy. He is considered a world authority on arginase deficiency which he has studied his entire career, in the clinic and in the laboratory. He helped found the parent support group that has become the ARD1-D Foundation and has been a continuous supporter to these families. More recently he has emphasized the pre-symptomatic DNA screening of individuals at risk for late onset autosomal dominant disorders. He lives in Santa Monica, California with his wife and they have two grown children.