Grammy award-winning producer Henry Walter aka Cirkut’s hits include the No.1 Grammy-winning hit Sam Smith & Kim Petras's "Unholy," Katy Perry’s "Dark Horse" and "Roar," Miley Cyrus’s "Wrecking Ball," Flo Rida’s "Good Feeling," Maroon 5 & Cardi B’s "Girls Like You," as well as nine songs on The Weeknd’s Grammy-winning Starboy album, including the title single.

Cirkut developed and produces pop star Ava Max, including her breakout hit single "Sweet But Psycho," which went to No.1 in 22 countries.

In 2023, "Unholy" won the Grammy for Best Pop Duo/Group Performance. In 2022, Cirkut won a Grammy for his work on "Hurricane" for Kanye West, The Weeknd, & Lil Baby. He also produced the key singles Elton John & Britney Spears's "Hold Me Closer" and Lil Nas X's "Star Walkin'."

Last year Cirkut launched his own publishing company, Cirkut Breaker, signing Connor McDonough, who went on to write and produce Joji’s global smash hit "Glimpse Of Us."