By the late 1920s he was living in Bremen, Germany, doing posters for the North German Lloyd steamship company and teaching art. But he returned to Austria, dying in Vienna aged 49.
As the title of this post indicates, Steiner had no recognizable style. On one hand, this meant he could stay current with changing illustration fads and fashions. On the other, this probably contributed to his lack of the fame that the likes of A.M. Cassandre and Ludwig Hohlwein attained in the poster field.