Prolific Midwest USA mastering and lacquer cutting engineer known for his work in a variety of underground music. Richardson retired on October 1, 2014.

He worked at the following:
1988 - 1991, Session Masters (Carol Stream, Illinois).
10/1991 - 10/2000, Metropolis Mastering, Ltd (Chicago, Illinois).
10/2000 - 10/2014, Prairie Cat Mastering (Belvidere, Illinois).

Etchings in vinyl runout grooves are either initials only (e.g., M.J.R.) or mastering house/initials combined. If the artists initials are prefixed with the mastering house initials, please don't include this in the ANV, use only the artist initials.

Session Masters (SS prefix - May 1988 to August 1991)
SSMJR

Metropolis Mastering Ltd. (MM prefix - October 1991 to October 2000)
MMMJR or M.M.M.J.R.

Prairie Cat Mastering (PC prefix - October 2000 to September 2014)
PCMJR