Henry Walter, known professionally as Cirkut, is a Canadian music producer and songwriter. He has been involved in numerous hit songs including co-producing and co-writing for the likes of Britney Spears, Ke$ha, Rihanna, Nicki Minaj, B.o.B, Lil Wayne and Taylor Swift. This includes the Billboard Hot 100 number one singles “Part of Me” and “Roar” by Katy Perry, and “Wrecking Ball” by Miley Cyrus. Walter was raised in Halifax and moved to Toronto in 2004. As a member of the Toronto-based Let’s Go to War, he co-produced the Britney Spears song, “Mmm Papi”, which appeared on her 2008 album, Circus. Walter opened Dream House Recording Studios in Toronto with partners Adrien Gough and Alex Bonenfant in 2010, and shortly thereafter relocated to Los Angeles, California to work with Luke “Dr. Luke” Gottwald’s production team. He has been described by the Hollywood Reporter as Dr. Luke’s “right-hand man and main production partner”.