Horst Mueller, I’m best known as the engineer/producer orbiting the German metal explosion of the 1980s (even though I’m listed as Swiss-born). In the 1983–1986 stretch I’m all over the credits that helped define the sound: engineering Destruction (1984–1985), Sodom (1985), Running Wild (1984–1985), Hellhammer (1984), and producing/engineering/mixing Kreator’s "Endless Pain" (1985), plus work for Warrant (1985) and Iron Angel (1985). And yeah—I wasn’t only “behind the glass”: I’m credited with effects and additional vocals for Celtic Frost in 1984–1985. Later on, my name pops up again in the 1990s and beyond (including a 1997 production credit and later compilation work), but that mid-80s run is the real high-voltage fingerprint.