Charles Massabo, also known as Kallaghan, is a French record producer, songwriter and musician, based in Los Angeles, California, United States, best known for his work with Falling in Reverse, Metro Station and other projects, such as Ronnie Radke's rap mixtape "Watch Me" and Jacky Vincent's solo project. Massabo produced and mixed Davey Suicide “Made from Fire” hitting Billboard charts #3 on Heatseakers, #14 on independent albums and #24 on top hard rock charts.