A.k.a. Maarten de Boer The Masters
Started out as a regular recording engineer but became a dedicated vinyl mastering engineer in 1982 setting up his own company: The Masters (formerly Holland Cutting Room), The Netherlands and also working at Emil Berliner Studios, Berlin, Germany. In the mid 80's did all vinyl mastering for Roadrunner Records. Appears on Holland Cutting Room pressings as "B" prefixed with HC (Holland Cutting).