M. John Harrison is an English author and literary critic. He has won the J. Tiptree Jr. Award, the Arthur C. Clarke Award, the Philip K. Dick Award, and the Goldsmiths Prize. He was also a judge for the Booker Prize in 2022. His work includes the Viriconium sequence of novels and short stories, Climbers, and the Kefahuchi Tract trilogy, which consists of Light, Nova Swing, and Empty Space.