Mother Teresa (1910-1997) is remembered by the world for her selfless service to the poor and the sick. For Mother, life was a mission to serve the suffering humanity. In 1948, Sister Teresa became Mother Teresa. In the same yea, she became an Indian citizen. She established the Missionaries of Charity in Calcutta (Kolkata). In 1957, the Missionaries began to work with lepers and in the field of education. She received the Nobel Peace Prize in 1979. She persuaded the people that leprosy is not contagious. She founded Nirmol Hridoy, Sishu Bhava, Mahatma Gandhi Leprosy Ashram and many other organizations. Now the Missionaries of Charity are working in 125 countries with more than 750 centers. Mother Teresa was awarded the Padma Shri and Bharat Ratna.