[1] Gerhard was one of the principal originators of the Instituto di corrispondenza archeologica,[1] founded at Rome in 1829, with the support of the Prussian crown prince, Frederick William.
Co-founders included Theodor Panofka, Otto Magnus von Stackelberg and August Kestner.
This model of international cooperation and systematic scientific publication was influenced by the example of Alexander von Humboldt, and later became the present-day German Archaeological Institute.
Returning to Germany in 1837 he was appointed archaeologist at the Royal Museum of Berlin, and was also elected a member of the American Antiquarian Society that same year.
[1] The New International Encyclopædia of 1905 gives the following evaluation of his work: Gerhard contributed to Platner et al.'s Beschreibung der Stadt Rom (Description of the city of Rome; Vol.