Mieczyslaw Dowmunt was born on December 6, 1880 in Warsaw, Poland, Russian Empire [now Warsaw, Mazowieckie, Poland] as Mieczyslaw Junczys. He was an actor, known for Usmiech losu (1927) and Czaty (1920). He died on May 1, 1949 in Bialystok, Podlaskie, Poland.