Swedish record producer, sound engineer, songwriter, and musician,
Born August 20, 1944, in Norrköping, Östergötland, Sweden,
Died May 20, 2025, in Stockholm.
He worked with ABBA between 1972-1982.
In 1966, he married Lilian B. Tretow in Paris, France. The couple had two children, Sofia Tretow (b. 1976) and Rasmus Tretow (b. 1985).