During the World War II he served as a soldier for Nazi Germany. He was captured by USA troops and brought overseas. However a friend of his father, who was a Nobel Prize laureate, arranged for Hertz to be freed and also found him a job in Lund, Sweden so that he could leave the States while still not having to return to Germany.
In 1885, at the age of 28, Heinrich Hertz was appointed professor of physics at the Karlsruhe University.
A portrait of Heinrich Hertz is one of the 56 portraits, in relief, of eminent citizens of Hamburg, on the columns in the entrance hall of the Rathaus (Town Hall).
Heirnrich Hertz' nephew Gustav Ludwig Hertz was a 1925 Nobel Prize winner in Physics (together with James Franck) "for their discovery of the laws governing the impact of an electron upon an atom" and Gustav's son CarlHellmuthHertz invented medical ultrasonography and ink jet printing.