According to the Internet source given below, Siegfried Reda was a German church musician and composer born in Bochum. He studied church music in the Dortmund Conservatory and composition under Ernst Pepping and Hugo Distler in the Berlin-Spandau church music school. From 1938 to 1941 he was an organist in Berlin. At the end of WW II he became a church musician in Gelsenkirchen and Bochum. In 1953 he became the church music director of the St. Petri-Kirche in Mülheim/Ruhr, he also lead the church music department of the Folkwang-Hochschule in Essen from 1946, Herbert Callhoff and Wolfgang Hufschmidt
being amongst his pupils. He died in Mülheim/Ruhr.
Siegfried Reda was a leading personality of his time and especially significant with regard to organ music composition, interpretation and construction.