Andrew Booker is a British drummer and vocalist best known for his work with Tim Bowness (in Bowness's solo band, No-Man and in Henry Fool) and with ex-Yes guitarist Peter Banks (in the improvising band Harmony in Diversity). Booker has also released a solo mini-album Ahead and had a duo called Pulse Engine with (bass). He also played with London-band The Fugitives, Michael Bearpark and David Cross. Booker organised the website and evening Improvizone, which led to one compilation available through the Burning Shed label.