S. R. Srinivasa Varadhan

Sathamangalam Ranga Iyengar Srinivasa Varadhan FRS (born 2 January 1940) is an Indian-American mathematician. He is known for his fundamental contributions to probability theory and in particular for creating a unified theory of large deviations.
Varadhan's awards and honours include the National Medal of Science (2010) from President Barack Obama, "the highest honour bestowed by the United States government on scientists, engineers and inventors". In 2007, he was awarded the Abel Prize.