[1][2] Efraimsson grew up on the Swedish west coast, in a town called Gothenburg.
He later moved to Stockholm, the capital of Sweden and a major source of worldwide hits from songwriters like Max Martin, Shellback, RedOne and Anders Bagge.
He has written songs for major recording artists like NKOTBSB (New Kids On The Block & Backstreet Boys), Snoop Dogg, 'Anouk, September, Marta Sánchez, Jennifer Rush, Sweetbox, Audio Playground, Edurne, Sweet California, Eric Saade as well as many others.
Alexie Divello Alisa Anouk Anniela Aitor Saez Audio Playground Axel Schylström Beatrice Beatrix Kiddo Camp Sweden Carina Dahl David Lindgren Deep Super Junior Donghae & Eunhyuk Edurne Eric Saade Eric Suen Fanclub Fatin GAC (Gamaliel Audrey Cantika) Gille Gita Gutawa Gloss Han Geng Inéz Jakob Karlberg Jennifer Rush
John Park Josef Sedraia Josefin Glenmark Judika Lia Larsson Lisa Ajax Maja Kristina Malena Laszlo Marta Sánchez Matilda Thompson Moncho Moncho & Tarequito Monsta X Nathalie Saba NKOTBSB (New Kids On The Block & Backstreet Boys) Ofelia Ola Lustig Rio Febrian Risa Hirako Sebastian Walldén Sean and Conor Price Seean September Shawn Lee Sweet California Sweetbox Tereza Kerndlova The Fooo Conspiracy Tooji Victoria Tocca Wiktoria What's Up Yamashita Tomohisa Younha Young Pharoz He has produced and/or mixed songs for many well known European and Asian artists, including September, Marta Sánchez, Edurne, Yamashita Tomohisa and more.