He began his acting career at the theater in Regensburg in 1882, it followed other engagements in different cities in Germany and Switzerland.
In Berlin he soon got in touch with the new arising film business and he appeared already in "Schuld und Sühne" (1909) in front of the camera for the first time.
A forebear of Hermann Seldeneck was the famous naturalist Alexander von Humboldt.
His activity in the film business even increased from 1915 and he played often authoritative roles which entertained a huge audience.
The actor Hermann Seldeneck was a very busy movie actor of the 10s whose film career limited nearly exclusively to this decade.
He also appeared on stage in the Russia metropolises St. Petersburg and Moscow for a while. When he returned to Germany he managed his path till to the German theater center in Berlin.
He appeared again on stage before he died at the age of only 57 in 1922.