Dr. Radhakrishnan is Professor of Medicine at Columbia University Medical Center. He is the Director of Clinical Services of the Nephrology Division. His clinical and research interests are the in the therapy of chronic kidney disease (including glomerular diseases and lupus kidney disease) and intensive care nephrology.

He is a fellow of the American Society of Nephrology and National Kidney Foundation. His commitment to medical education and patient care is exemplified by his numerous teaching awards and his inclusion in the Who's Who among America's Teachers & Educators, America's Best Doctors and Castle Connolly's Top Doctor.