[2][3][4][5] Goldsack joined the Australian Baptist Missionary Society in 1899, where he mastered languages before being placed at mission station Pabna, East Bengal.
At Pabna, he devoted his missionary work to preaching and teaching; additionally, he purchased the land for mission to erect new Zenana house.
Having been influenced by George Henry Rouse, head of the Baptist Mission Press at Calcutta, West Bengal, he devoted himself to the Islamic studies and literary work; thus, he wrote many apologetic tracts and pamphlets.
[2][3][4][5][8] He remained Christian all his life, although devoted all his missionary work in Islamic studies and literature for evangelizing Bengali Muslims.
He retired from missionary service in 1923, due to Malaria and recurrent boils; later part of his life was spent in fruit farming in South Australia, along with his family.