His recordings have been embraced by a variety of ambient fans, ranging from the '70s traditionalists at the Hearts of Space label to the ambient-techno experimentalists at Plug Research. Born and raised in North Wales, Williams first performed as Lustmord in 1980 as a series of unannounced "support slots" at larger gigs, with Williams simply leaping on-stage and performing until security became aware of the situation. Though understandably brief, the rock terrorism gained Williams contact with like minds in the proto-industrial scene, including SPK and Throbbing Gristle. He soon began appearing with SPK on tour and in the studio, and in 1981 released a self-titled Lustmord LP, including work by Coil's John Balance and Nocturnal Emissions' Nigel Ayers (who issued the album on his Sterile Records). His second album, Paradise Disowned (released by SPK's Side Effects label in 1986), featured recordings made in a variety of subterranean locales including the crypt at Chartres Cathedral, Dunster Abattoir in Bangor, Wales, and on the ocean floor. By that time, Williams had also taken over running Side Effects.

Though he released no additional Lustmord material during the rest of the '80s, Williams did record (and do sound research) for albums by Current 93, Nurse with Wound, SPK, Chris & Cosey, and SPK member Graeme Revell's solo LP The Insect Musicians. Lustmord returned in 1990 with Heresy (Soleilmoon) and released a pair of albums for Side Effects, The Monstrous Soul in 1992 and Place Where the Black Stars Hang in 1994. Also during the first half of the '90s, he collaborated with Andrew Lagowski under the name Terror Against Terror, and released solo albums under the monikers Arecibo and Isolrubin BK. Williams moved to California during the '90s after being recruited by Graeme Revell to work on his sound library for the scores of feature films including Mighty Morphin Power Rangers, Street Fighter, Teenage Mutant Ninja Turtles, The Crow, and Spawn, among others.

Another Williams collaboration, this one with space music pioneer Robert Rich, debuted with the 1995 release of Rich's Stalker album, recorded for Hearts of Space. One year later, Williams responded to requests from the ambient-techno DJ community for Lustmord material on vinyl by releasing a single for Plug Research. The recording inspired his next project, a collaborative live album named Lustmord vs. Metal Beast that skirted the edges of dark ambient-techno. The compilation Purifying Fire appeared in summer 2000, but it was his critically acclaimed Metavoid (2001) that raised eyebrows. Lustmord's soundtrack to the psychological horror film Zoetrope was released in 2002. Also that year, he collaborated with breakcore artist Hecate (Rachael Kozak) on an EP titled Law of the Battle of Conquest, released by Hymen Records in late 2002.

The year 2004 saw the release of Lustmord's Carbon/Core album, as well as a collaboration with the Melvins titled Pigs of the Roman Empire, which was issued by Mike Patton's Ipecac Records. Williams' ties to the alternative metal world strengthened when he worked on Tool's 2006 album, 10,000 Days, as well as the debut album by Puscifer, a side project of Tool leader Maynard James Keenan. In 2006, Lustmord performed live for the first time in 25 years during a high mass observance by the Church of Satan. The concert was released by Williams' Vaultworks imprint under the name Rising. Lustmord's 2007 album Juggernaut was released by Isis leader Aaron Turner's Hydra Head Records, and featured guitar and vocals from the Melvins' King Buzzo. Lustmord's second release for the label, 2008's [Other], included guest appearances by both Turner and Buzzo. Two discs of extended ambient versions of [Other] tracks, [The Dark Places of the Earth] and [Beyond], appeared on Vaultworks in 2009. Additionally, the dub-focused EPs [Other Dub] and [Transmuted] (the latter featuring a mix by Justin K. Broadrick) were released that year.

Williams celebrated the 20th anniversary of Heresy with Heretic, an album of alternate mixes and early versions, issued in 2010. He then released Songs of Gods and Demons, a collection of recordings for movies, video games, and TV shows, in 2011. In 2013, German label Vinyl-On-Demand released Things That Were, a three-LP box set that included a remastered edition of Lustmord's first album, rarities, and unreleased material. Also that year, Blackest Ever Black released Lustmord's studio album The Word as Power, which featured guest vocals by Keenan, Jarboe, and others. Live albums Kraków and Stockholm followed on Vaultworks, and in 2015, Lustmord remixed Japanese band Vampillia's song "Sea" on a limited-edition CD EP. Lustmord's solo dark ambient album Dark Matter was released by Touch in 2016. ~ John Bush & Paul Simpson