|Big Boss was born in Czech Republic in 1952 to pianist Milan Valter.
In 1987, when playing in band Vega, he met guitarist Petr Hošek, with whom he later founded black metal band Root. Root recorded their first demo Deep in Hell in 1988. In 1990 the band released debut album called Zjevení (Relevation). Big Boss launched his side project Equirhodont with his Root bandmates Ashok and Igor in 2002. In addition to his activities with these two bands, he has also recorded two solo albums.
He lists The Beatles, Beach Boys, Chris Farlowe, David Bowie, Jimi Hendrix, Jeff Lynne and Electric Light Orchestra and Vanilla Fudge to be his main influences.