Dr. Warden worked as a postgraduate researcher at the Molecular Biology Institute at UCLA and transferred to the Atherosclerosis Research Unit in the Division of Cardiology at UCLA in 1984. In 1995 he joined the faculty at the University of California, Davis, as an assistant professor of pediatrics, where he is also a member of the Rowe Program in Genetics. His research interests include the identification and isolation of genes underlying common, complex diseases such as obesity, atherosclerosis and diabetes; the chromosomal mapping and cloning of diet-responsive genes that affect obesity and atherosclerosis; and the use of both human family studies and mouse models to investigate mechanisms of complex diseases.