Steve Chinnis an independent lecturer, writer, and researcher, and Visiting Professor at the University of Derby, UK. He spent twenty-four years as head teacher of three specialist schools and was a mainstream teacher for fourteen years. He was Founder and Principal of Mark College in Somerset, UK, a specialist residential school for young people with specific learning difficulties. In 2011 he set up and chaired the BDA s first subcommittee on dyscalculia. He has received the Marion Welchman International Award for Services to Dyslexia, and the Lady Radnor Award for Lifetime Services to Dyslexia. He has lectured and taught in over 30 countries worldwide and has spoken at many major conferences. He is the author of numerous books, including The Trouble with Maths (3rdedition, 2016), The Routledge International Handbook of Dyscalculia and Mathematical Learning Difficulties(2015), More Trouble with Maths: A Complete Guide to Identifying and Diagnosing Mathematical Difficulties (2nd edition 2016), and The Fear of Maths (3rdedition, 2011). Richard Ashcroft was Headmaster at Mark College, UK, a specialist residential school for young people with specific learning difficulties. He taught mathematics at the secondary school level for almost 25 years. During his teaching career, he developed a series of teaching resources specifically for dyslexic students. He retired in 2006.