Steponas Kosmauskas was born on April 29, 1918 in Darbutai, Kaunas County, Lithuania, Ober Ost. He was an actor, known for Zinvorn u pighe (1978), Naktys be nakvynes (1967) and Linksmos istorijos (1973). He died on March 25, 1985 in Panevezys, Lithuanian SSR, USSR.