Since Kjartan got his engineering degree he has worked on children’s tv (dating back to BBC’s Swap Shop!), presented science and maths programmes, warmed up thousands of studio audiences, toured his one man show, played a lot of pub pianos very loudly and has been Widow Twankey. In the last 10 years he has appeared all over the country as well as on tv demonstrating mathematical tricks and oddities from his books.

His books have been translated into over 25 languages and include the “Murderous Maths” series which is all being re-issued with brand-new covers. In recent years has also written the novels “Urgum The Axeman”, “Urgum and the Seat of Flames” and “Urgum and the Googoobah” which was shortlisted for the first Roald Dahl Funny prize in 2008.

He’s married to Bridget, they have four girls and his mentionable hobbies include running his websites, astronomy, magic tricks, making strange noises on his moog sythesisers and mending his old pinball table.