Henry Russell Walter, known professionally as Cirkut, is a Canadian record producer and songwriter. He has co-produced and co-written commercially successful singles, often in tandem with American record producer Dr. Luke and Swedish producer Max Martin since 2008. His credits include songs and albums for prominent artists including Katy Perry, Becky G, Ava Max, Nicki Minaj, R. City, the Weeknd, Kesha, Ciara, Pitbull, Britney Spears, Ne-Yo, Rihanna, Adam Lambert, B.o.B, Marina and the Diamonds, will.i.am, Jungkook, G.R.L. and Juicy J, among others.

Łukasz Sebastian Gottwald, known professionally as Dr. Luke, Tyson Trax, and Made in China, is an American songwriter and record producer. His professional music career began in the late-night television sketch comedy show Saturday Night Live as its house band's lead guitarist in 1997 and producing remixes for artists such as Bon Jovi and Gravediggaz. He came into music prominence in 2004 for producing Kelly Clarkson's single "Since U Been Gone" with Swedish record producer Max Martin.