Cirkut (record producer) - Wikipedia, the free encyclopedia: "Henry Russell Walter, known professionally as Cirkut, is a Canadian music producer and songwriter. Described by The Hollywood Reporter as record producer Dr. Luke's "right-hand man and main production partner",[2] he has co-produced and co-written for Britney Spears, Ke$ha, Rihanna, Nicki Minaj, B.o.B, Lil Wayne and Taylor Swift, including the Billboard Hot 100 No. 1 singles, "Part of Me" and "Roar" by Katy Perry, and "Wrecking Ball" by Miley Cyrus."
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