Johnny Ball

Graham Thalben Ball, professionally known as Johnny Ball, is an English television personality, children's television presenter, writer and populariser of mathematics. Ball regularly appeared on British television for several decades, predominantly on the BBC, from 1967, featuring in or presenting programmes such as Play School, Think of a Number, Think Again, Think It ... Do It, Think...This Way and Johnny Ball Reveals All. He has also published a number of non-fiction books.