Amartya Sen is an Indian economist known for his work on welfare economics, social choice theory, and economic theories of famine. He received the Nobel Prize in Economics in 1998 for his contributions to welfare economics and social choice theory, and his interest in addressing the problems faced by the world's poorest people. Some of Sen's key accomplishments include developing the capability approach to measure well-being and development, explaining how famines can occur despite an availability of food, and establishing indexes to measure well-being in developing countries. He has authored numerous influential books and received many honors, including the Bharat Ratna award.