Known for his devotion to technical perfection, Jonas W. Karlsson is internationally respected both as a Mastering Engineer as well as a producer and songwriter.

Prior to his mastering career, in 2020, he was awarded the best R&B Album Grammy for his work on John Legend’s “Bigger Love”. In 2015, he won the Finnish Grammy, Emma, for Song of The Year “Vadelmavene”. Other collaborations include artists such as Tinashe, Jhené Aiko, Amber Mark, ZAYN, blackbear, BIA, Iggy Pop, 24hrs, Kito, Hatsune Miku, Bhavi, Fletcher, Sofi de la Torre, Kareen Lomax, NVDES, Lao Ra, KODA, and more.