He served as Governor of Suriname (1908–1911), Speaker of the House of Representatives (1917–1921) and Governor-General of the Dutch East Indies (1921–1926).

[1] After attending Gymnasium Haganum, Fock studied law at Leiden University from 1875 to 1880.

[2] After graduating, Fock went to the Dutch East Indies (now: Indonesia) where he worked as a lawyer and prosecutor in Batavia until 1898.

In 1899, the family returned to the Netherlands and Fock started practising law in Rotterdam.

On 3 April 1919, he temporarily resigned from the States General, after Governor van Limburg Stirum of the Dutch East Indies pleaded for radical changes in the colony which was at odds with Fock's view of a gentle evolution.

[1] On 24 March 1921, Fock was appointed Governor-General of the Dutch East Indies succeeding his former adversary van Limburg Stirum.