Question: "Drop That Kitty" is a song by American rapper Ty Dolla Sign, featuring English singer Charli XCX and American singer Tinashe, the  track was produced by Stargate and which Norwegian DJ, record producer, musician and turntablist, known professionally as who?
Sentence (from "Drop That Kitty"): The song was written by Ty Dolla Sign, Tinashe, and Charlotte Atichison.
Relevant evidence: No