Keith Tenniswood is an English electronic music producer and DJ from London who began his career in the early 1990s, releasing work under the Radioactive Man alias and as one half of the duo Two Lone Swordsmen. His output moves through electro, techno, acid and breakbeat influences—combining analogue synthesis with sample-based production—and he has released material on independent imprints while maintaining a presence in the UK club and remix scenes.