John Lenahan (born 1961 in Philadelphia, US) is an American illusionist[1] and entertainer resident in the UK since 1984.

A successful corporate entertainer, he came to greater fame as a result of a 1994 appearance on the BBC One show How Do They Do That?

explaining the sleight of hand trick known as Three-card Monte, as a result of which he became the first person in 85 years to be expelled from The Magic Circle.

The 1987 series featured Lenahan travelling across the UK and finding out about the lives and traditions of British people.

It was announced in early 2022 that Lightning Books would publish Son of Shadow, taking the characters from the Shadowmagic trilogy into the next generation, in July of that year.