He has a son named Hans Heinz Theyer (Hans H. Theyer, born 1910)
Besides Europa he was also often in Asia. Later he shot propaganda movies during World War I.
The cinematographer Hans Theyer finished an education at the Graphische Lehr- und Versuchsanstalt in Vienna before he began his professional career by Pathé Frères. For this company he shot numerous documentaries which led him around the world.
He realised his first feature movie as a cinematographer in 1914 with "Durchs Ziel" (1914) but his real film career as a cinematographer began in 1920.
Besides his activity as a cinematographer he also realised few movies as a director.