Father Celestine Kapsner, O.S.B. began working at the St. John's parish mission in 1928. Among other duties and activities, Kapsner was in charge of the garden. Kapsner was known to have taken part in many exorcisms. He translated a 1928 account of an exorcism by Father Theophilus Riesinger from a German magazine article, and published it in 1935 as Begone Satan! Father Kapsner died in Minnesota in January 1973. This book is important because it brings a detailed account of an American exorcism to a large audience for the first time in the United States.