Dr. Klein relocated from Chicago after graduating from the University Of Illinois College Of Medicine. He did both his internal medicine residency and nephrology fellowship at Columbia Presbyterian Medical Center. While there, his house staff peers awarded him the Joseph Muschel memorial house staff award for excellence in ethics and patient care. He joined the faculty of New York Medical College in 1998 where he is currently appointed as Associate Professor of Clinical Medicine. He is known as an outstanding teacher and has been recognized repeatedly for his contributions to education in the medical school and the house staff training programs. Dr. Klein is the medical director of Dialysis Clinics Inc. Valhalla dialysis unit and of the Westchester Medical Center inpatient dialysis program. He also holds a JD from the University of Illinois and has been admitted to the Illinois Bar Association. He treats all forms of kidney disease but has special interests in dialysis, fluids and electrolytes, glomerular disease, and all stages of chronic kidney disease.