Kaisu Leppänen was born on October 13, 1904 in Turku, Finland as Katri Sisko Leppänen. She was an actress, known for Vieras mies tuli taloon (1938), Kun on tunteet (1954) and Syyllisiäkö? (1938). She was married to Jarl Koivulaakso, Tauno Majuri and Ilmari Unho. She died on March 4, 1993 in Helsinki, Finland.