He was born in Kristiania as a son of Colonel Gerhard Christopher Krogh (1839–1916) and Thora Regine Clementine Angelica Neumann (1856–1928).
[1] In 1920 he was convicted as responsible for the physical assault by some workers on Henrik Ameln; they had attended a meeting where Krogh called for revolutionary actions.
He found work during the occupation of Norway by Nazi Germany as a consultant in the Norwegian Ministry of Culture and Enlightenment from 1940 to 1941.
[6] From 1943 he was an office manager in Granskningskommisjonen av 1943,[6] a commission that was tasked with scrutinizing the actions of Nygaardsvold's Cabinet prior to the war, and thus find legal grounds for the Nazi usurpation of power.
[7] In 1948, during the legal purge in Norway after World War II, Krogh was tried and convicted of treason and sentenced to two years and three months of forced labour.