Career

Rosenberg was the first chief manager of the Russian-American Company since Semyon Yanovsky to not serve a five year term. During his three years of overseeing company operations from New Archangel, Rosenberg "proved especially inept at maintaining good relationships with the Tlingits." His leadership antagonised Sitka Tlignit and precipitated a skirmish outside the settlement. He later earned the enmity of Stikine River based Tlignits for not warning them of the hostile intentions of a Sitka band of Tlignits.

Rosenberg was later replaced by Aleksandr Ilich Rudakov in 1853.