From 1909 to 1914 he was vicar in Vestnes, and in 1916 he was appointed curate in the Diocese of Kristiania with special responsibility to hold ceremonies in Nynorsk.
[2][3] Sletten was married to Aagot Hansen from Kristiania from September 1902 to her death in January 1912.
He later married Elvine Staven, a farmer's daughter from Namdalseid Municipality, in September 1936.
He also released his own work; Koralbok for det norske folk.
This biographical article about a Norwegian religious figure is a stub.