Holl was appointed to the legislative council in 1840 by governor Charles Augustus FitzRoy. Responsible government came to the island in 1851. In 1853 the Liberal government of the colony"s first premier, George Coles, was defeated in the general election and was forced to resign in early 1854 when it could not command the support of the House of Assembly which now had a Conservative majority.
Holl was appointed Premier despite the fact that he sat in the appointed legislative council rather than the elected House of Assembly.
Holl continued to sit in the legislative council until leaving the island in 1856.