In 1982, prior to joining Suicidal Tendencies, George joined a short-lived punk side project called "Pap Smear", formed by Slayer members Jeff Hanneman and Dave Lombardo. Although Pap Smear has never released any records, two of their songs were re-recorded on Slayer's 1996 covers album Undisputed Attitude. After Pap Smear broke up around 1985, George joined Suicidal Tendencies, replacing Jon Nelson, who replaced the first album's guitarist Grant Estes. His debut with the band was Welcome to Venice on the song "Look Up..(The Boys Are Back)" written by Jon Nelson and Mike Muir. George is largely considered responsible for moving Suicidal Tendencies away from their hardcore punk roots into a more thrash oriented territory. He is also responsible for Robert Trujillo joining the band, who was a high school friend of his (at Culver City High School).
Rocky has used Ibanez guitars almost exclusively for years (particularly the RG series and Universe 7-strings). He is still endorsed by Ibanez. Despite rumors, however, Rocky did not design the RG series (as "RG" stands for Roadstar Guitar, not for Rocky George). He is also a long time user of Mesa Boogie amplifiers.