Ian Nicholas Stewart FRS CMath FIMA (born 24 September 1945) is a British mathematician and a popular -science and science-fiction writer. He is Emeritus Professor of Mathematics at the University of Warwick, England. Stewart was born in 1945 in England. While in the sixth form at Harvey Grammar School in Folkestone he came to the attention of the mathematics teacher. The teacher had Stewart sit mock A-level examinations without any preparation along with the upper-sixth students; Stewart was placed first in the examination. He was awarded a scholarship to study at the University of Cambridge as an undergraduate student of Churchill College, Cambridge, where he studied the Mathematical Tripos and obtained a first-class Bachelor of Arts degree in mathematics in 1966. Stewart then went to the University of Warwick where his PhD on Lie algebras was supervised by Brian Hartley and completed in 1969.

For more information press the link below:
https://en.wikipedia.org/wiki/Ian_Stewart_(mathematician)