After the war, Steiger continued his studies in special education and pursued a teaching career in Arlesheim and Basel. He also continued his activities on behalf of Jews. He founded an association to assist Jewish children. He married in 1956 and had three children. Between 1958 and 1990, he led annual memorial events on the Day of Remembrance for the Jewish children who perished in the Holocaust (Tag des jüdischen Kindes). He was a member of the German Coordination Committee for Jewish-Christian Cooperation, the Swiss-Israeli Association, and the Friends of Kiryat Yearim Children.[3]
In 1982, Steiger published a book about his experiences as a teacher at Château de la Hille ("Die Kinder von Schloss La Hille"). In 1985, Steiger visited Lehavot HaBashan and met with the children he had educated at Château de la Hille.[2]