<human>:  What is the name of the man who knew infinity in the book ‘The Man Who Knew Infinity Bright, John’?
<bot>: The man who knew infinity was Srinivasa Ramanujan. He was a brilliant Indian mathematician who worked for the British Government in India. He published his work in a series of letters to his friend G.H. Hardy, a famous mathematician. Ramanujan's work on infinite series and continued fractions led to many discoveries, including the theory of modular forms. He died in 1920 at the age of 32.