A.k.a. Gregory Calbi
Senior mastering engineer who began his mastering work in 1973 at Record Plant. Three years later (1976) he moved to Sterling Sound, where he mastered records for nearly 20 years. In 1994 he switched to Masterdisk for 4 years, before eventually returning to Sterling Sound again in 1998. Etched GC, ☆, or ⚾ (a baseball - can be mistaken as H in cirlce) can often be found near the Sterling stamp in a runout. Do not create Alias or ANVs for them, the symbols can be added in the credit section as "Mastered By [runout Etch ☆ or ⚾] - Greg Calbi".