Previously, he was an Instructor in Medicine at Stanford University School of Medicine. He completed postgraduate medical training at Stanford Hospital and Clinics, including a residency in Internal Medicine and a clinical fellowship in Endocrinology. Dr. Banerjee performed postdoctoral research in the lab of Dr. Seung Kim, (Stanford University Department of Developmental Biology) studying mechanisms of hormonal regulation of beta-cell proliferation and functional adaptation, particularly during pregnancy.