Matt Parker, known as the Stand-up Mathematician, can be seen talking about maths on the BBC and the Discovery Channel, in the Guardian and on stages across the UK. His book "Humble Pi" was the first maths book to be a Sunday Times #1 bestseller. His YouTube videos on the Stand-up Maths and Numberphile channels have amassed over 100 million views. In 2018 Matt calculated the number pi live on-stage in front of a sold-out Royal Albert Hall using a real pie. He is also the first person to use an overhead projector at the Hammersmith Apollo since Pink Floyd.