I write and I talk. Usually about mathematics, puzzles, football or Brazil. My books – which have sold more than 700,000 copies and been translated into more than 20 languages – include Alex’s Adventures in Numberland, Can You Solve My Problems?, Futebol: The Brazilian Way of Life and the children’s book series Football School. I also write a puzzle column in the Guardian, and present documentaries on BBC Radio 4. My YouTube videos have registered more than 30 million views.

I am also an experienced public speaker. I give keynotes at educational conferences, speak at corporate events and visit many schools and colleges in the UK and beyond. If you would like me to come to your institution, please get in touch.

To subscribe to my Guardian puzzle alert, email me. I’ll let you know via email each time a new puzzle is posted.