His new book is In Pursuit of the Unknown: 17 Equations That Changed the World.
One of Stewart's top ten popular mathematics books, as told to the Guardian:
Gödel, Escher, Bach by Douglas HofstadterRead about the other books on the list.
One of the great cult books, a very original take on the logical paradoxes associated with self-reference, such as "this statement is false". Hofstadter combines the mathematical logic of Kurt Gödel, who proved that some questions in arithmetic can never be answered, with the etchings of Maurits Escher and the music of Bach. Frequent dramatic dialogues between Lewis Carroll's characters Achilles and the Tortoise motivate key topics in a highly original manner, along with their friend Crab who invents the tortoise-chomping record player. DNA and computers get extensive treatment too.
Gödel, Escher, Bach is one of Dan Brown's six favorite books.
The Page 99 Test: Ian Stewart's Why Beauty Is Truth.