Dr Edward Denison is a Lecturer at The Bartlett School of Architecture (UCL) and an independent consultant, writer and photographer specialising in global histories of architecture and the built environment.

His work for various international organisations in places as diverse as Africa, China and Europe regularly features in print, electronic and broadcast media internationally. Nick continues to collaborate with a diverse range and number of scholars, public intellectuals, artists and architects in pursuit of this research.

Ian Stewart is Professor Emeritus of Mathematics at the University of Warwick and the author of the bestseller Professor Stewart's Cabinet of Mathematics Curiosities. His recent books include Significant Figures, Incredible Numbers, Seventeen Equations that Changed the World, Professor Stewart's Casebook of Mathematical Mysteries and Calculating the Cosmos (all published by Profile). His app, Incredible Numbers, was published jointly by Profile and Touch Press in 2014. He is a Fellow of the Royal Society.