Bryan Lamar Simmons, professionally known as TM88, is an American record producer and DJ from Atlanta, Georgia. He is part of the Atlanta-based record production team 808 Mafia, as one of its lead members alongside Southside. Simmons produced the 2017 hit single "XO Tour Llif3" by Lil Uzi Vert, which peaked at number seven on the Billboard Hot 100 and received diamond certification by the Recording Industry Association of America (RIAA). His other notable production credits include songs for Young Thug, Future, Gucci Mane, Migos, Wiz Khalifa, and Juicy J; he formed the group TGOD Mafia with the latter two in 2016, with whom he released a collaborative studio album in June of that year.

Joshua Howard Luellen, known professionally as Southside, is an American record producer, rapper and songwriter. Based in Atlanta, he is recognized in the music industry for his aggressive, trap-infused production work for prominent hip hop artists. His production work for hometown rapper Waka Flocka Flame led Luellen to sign with his label Brick Squad Monopoly, an imprint of Gucci Mane's 1017 Records as in-house talent in 2010. Luellen and labelmate, fellow producer Lex Luger established the production team 808 Mafia that same year, which has been credited on commercially successful releases throughout the remaining decade.