Producer: Dr. Luke - Artist: Rihanna - Producer: Cirkut - Producer: Kuk Harrell - Recording Engineer: Kuk Harrell - Recording Engineer: Marcos Tovar - Asst. Recording Engineer: Jennifer Rosales - Engineer: Aubry "Big Juice" Delaine - Engineer: Clint Gibbs - Producer: Calvin Harris - Asst. Recording Engineer: Chris Sclafani - Asst. Recording Engineer: Jonathan Sher - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Recording Engineer: Calvin Harris - Assistant Mixer: Phil Seaford