Carl Anthony Falk-Gramer, is a Swedish songwriter, record producer and musician and has worked with artists such as Demi Lovato, One Direction, 5 Seconds of Summer, Nicki Minaj, Ellie Goulding, Madonna, Avicii, Ariana Grande, Charlie Puth, Jason Derulo, Westlife, Hilary Duff, Iggy Azalea, Liam Payne. Wikipedia