Cirkut

Henry Russell Walter (born April 23, 1986), known professionally as Cirkut, is a Canadian record producer and songwriter.

He has co-produced and co-written for Dr. Luke, 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.

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.

Walter was born and raised in Halifax, Nova Scotia and moved to Toronto in 2004.

He co-produced the Britney Spears song "Mmm Papi" which appeared on her 2008 album Circus.

He sent it as an instrumental track to Kobalt Music Group via their attorney Chris Taylor, where songwriter Nicole Morier began using it to write with Britney Spears.

Walter opened Dream House Studios in Toronto.

He then relocated to Los Angeles, California.

He co-produced "Part of Me", the title song to Katy Perry's 2012 concert film Katy Perry: Part of Me.

Walter was also responsible for producing and co-writing the Weeknd's track "High for This".

In 2016, he co-produced and co-wrote 9 songs on the Weeknd's album Starboy.

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His production credits on the Weeknd's album Starboy won him the 2018 Grammy Award for Best Urban Contemporary Album.

His most recent collaboration was on Jungkook's song "Standing Next to You" (2023).