Björn Ulvaeus was born on April 25, 1945 in Gothenburg, Västra Götalands län, Sweden. He is known for Mamma Mia! (2008), Mamma Mia! Here We Go Again (2018) and The Martian (2015). He has been married to Lena Källersjö since January 5, 1981. They have two children. He was previously married to Agnetha Fältskog.