Henry Walter, known professionally as CIRKUT, is a Canadian record producer and songwriter who has co-produced and co-written for Rihanna, Kanye West, Maroon 5, Pitbull, Katy Perry, Miley Cyrus, The Weeknd, Britney Spears, Jessie J, Kesha, Shakira, Nicki Minaj, B.o.B and songs he has written and produced include the Billboard Hot 100 No. 1 singles "Part of Me", "Roar" and "Dark Horse" by Katy Perry, and "Wrecking Ball" by Miley Cyrus. His production credits on The Weeknd's album Starboy won him the 2018 Grammy Award for Best Urban Contemporary Album. Cirkut developed and executive produced pop sensation Ava Max including the billion streamer No.1 record ’Sweet but Psycho’ and smashes ‘Kings & Queens’ and ‘Head My Heart’. His most recent collaboration was on Kanye West's 10th studio album Donda for the standout track ‘Hurricane'.