263.

November 14th is celebrated as "World Diabetes day" all over the globe. (Logo given below) From 2009-2013, the theme of this day has been Diabetes Education and Prevention. This day aims at spreading awareness all over the world about Diabetes and its ill effects. This specific day was chosen because it coincided with the birthday of a Nobel Laureate who was instrumental in leading the fight against Diabetes mellitus. Coincidentally its also celebrated as Children's Day in India. Who is the person described?