He is a member of the Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, the Center of Reproductive Sciences, and the Diller Cancer Center. He holds appointments in the Departments of Urology, Obstetrics/Gynecology, and Pathology. He is clinically trained in Clinical Pathology and Transfusion Medicine. His research interests are in the epigenetic regulation of stem cells and cancer. His major focus in the past few years has been on the role of non-coding small RNAs, microRNAs and endo-siRNAs, in regulating embryonic stem cell self-renewal and differentiation. He is currently expanding these efforts into somatic stem cells and cancer. He has expertise in genetics, genomics, epigenetics, small RNAs, stem cell biology, embryology, and cancer.