Rosenberg was born in
Turku in 1879. He worked as a locomotive driver and newspaper editor. Rosenberg was a member of the
Finnish Communist Party.{{cite journal|author=John H. Hodgson|title=The Finnish Communist Party|journal=
Slavic Review|date=March 1970|volume=29|issue=1|page=74|doi=10.2307/2493091|jstor=2493091 In the period between 1 December 1939 and 12 March 1940 Rosenberg served as vice president and finance minister in the cabinet, known as Terijoki government, led by
Otto Wille Kuusinen.{{cite news|author=Jukka Halonen|title=Terijoen teatteri|work=
Iltalehti|date=27 November 2019 His son, Gösta Rosenberg, was a member of the
Parliament for the Communist Party between 1945 and 1966. ==References==