Michael Atiyah, British-Lebanese mathematician (born 1929)

Sir Michael Francis Atiyah was a British-Lebanese mathematician specialising in geometry. His contributions include the Atiyah–Singer index theorem and co-founding topological K-theory. He was awarded the Fields Medal in 1966 and the Abel Prize in 2004.

January 11 is the 11th day of the year in the Gregorian calendar; 354 days remain until the end of the year.