Bob Ludwig

Robert C. Ludwig

The president of the company [l265594] & DVD, located in Portland, Maine, USA.

Renowned mastering engineer who, as a rule of thumb, is normally credited as 'Bob Ludwig' on pop/rock/mainstream releases and as 'Robert C. Ludwig' or 'Robert Ludwig' on classical recordings. Pre 1972, when mastering generally went uncredited, his initials 'RL' were usually cut into the run-outs in his [l=Sterling Sound] (whose wax imprint was 'SS'), and [l=Masterdisk], NY days.

http://www.gatewaymastering.com/
http://en.wikipedia.org/wiki/Bob_Ludwig