Alex Bellos is the author of the bestselling popular maths books Alex's Adventures in Numberland and Alex Through the Looking Glass . He is the Guardian 's maths and puzzles blogger, a regular science presenter on BBC Radio and a globally familiar face promoting mathematics on television, over social media and in talks. His most popular YouTube clip (about the scientific way to cut a cake) has had more than thirteen million views. He used to be the Guardian 's foreign correspondent in South America, where he wrote a book on Brazilian football and was Pelé's ghostwriter. alexbellos.com / @alexbellos Edmund Harriss is a well-known mathematical artist. He has a PhD in maths from Imperial College, London, and is currently working at the University of Arkansas in America. Having researched different aspects of geometry in tiling and patterns, he now specialises in unusual applications of mathematics.

These range from traditional physics (modelling two-dimensional crystals) to cutting-edge design and technology, such as controlling robots. maxwelldemon.com / @gelada.