Vegard Sverre Tveitan, better known by his stage name Ihsahn, is a Norwegian musician, singer, songwriter, record producer, and composer who is best known for his work with the black metal band Emperor. Tveitan is also a founding member of Thou Shalt Suffer, where he played guitar and keyboard in addition to vocal duties, and Peccatum, a project in collaboration with his wife and fellow musician Heidi Solberg Tveitan, also known as Starofash. Since 2006, Tveitan has primarily devoted himself to solo albums and occasional guest appearances.