Bob Ludwig

American mastering and lacquer cutting engineer, born December 11, 1944 in Savannah, Georgia, USA. Started his career at A&R Studios in early October, 1967 and later worked at A&R Studios (from 1969 to 1975) and A&R Studios, becoming vice-president at both. In 1992 founded Gateway Mastering in Portland, Maine. In July 2023, he announced his retirement and the closure of Gateway Mastering.

As a rule of thumb he is generally credited as "Bob Ludwig" on pop/rock/mainstream releases and as "Robert C. Ludwig" or "Robert Ludwig" on classical releases. His cuts can be recognized by his initials "RL" or block-lettered "rL" (sometimes misread as "ΓL") etched in the runouts