Dinker Belle Rai is a Board Certified Indian American vascular surgeon who serves as the Chairman of the Department of Surgery and as the Chief of the Department of Vascular Surgery / Vascular Laboratory at the Interfaith Medical Center, Brooklyn, New York. He is a visiting Clinical Professor at the Health & Science Center of the State University of New York in Brooklyn and a visiting Professor at the Rajiv Gandhi University in Bangalore, India. Rai is a Fellow of the American College of Surgeons and a Fellow of the Royal Canadian College of Surgeons. He is credited with developing the first ever method for retrograde catheterization of the venous tree. This invention was given a United States patent in 1988. Based on this patent, a company called The Ideas For Medicine, Inc. (now part of Horizon Medical Products, Inc.) manufactured and still distributes out a series of catheters, known as Rai’s Catheters for use in performing descending phlebographic tests and for venous embolectomies. He is also credited with the discovery of the motion of venous valves in human beings. His original research on histopathological specimens of patients with saphenofemoral – incompetency resulted in a paradigm shift in management of varicose veins. He performed the first ever vein transplantation below the knee. The discovery of right atrial mechanical function is a pivotal discovery in his medical research work. He is an editor for the International Journal of Angiology. Rai has been featured in the book "Jewels of India" for his contributions in the medicine, art, sports and cultural arenas.