[1] After completing his schooling Grant worked in the motor industry and as a cinema projectionist until in 1934 he was accepted as a candidate of the Presbyterian ministry and he studied under the 'Home Mission Scheme' and attended St Andrew's Theological College in Sydney.
[1] After being ordained Grant was called to work for the Australian Inland Mission in Tennant Creek (Jurnkkurakurr) and, to take up this role, he and Erla departed from Sydney on 1 December 1939 and, from Alice Springs (Mparntwe) they were assisted by Kingsley Partridge who drove them the final length.
[1] When Japan entered the war Grant became a full-time chaplain and was relocated to Darwin (Garramilla) while his family headed south for safety and to address the health concerns of one of his daughters.
[1] In Adelaide River he also established on open air cinema for the troops which he ran for a while by himself and he would run two double feature shows a week to huge audiences.
While serving in this role he assisted in organising a health survey of Aboriginal people living in the region and for the delivery of polio vaccines to children.
[1][6] He maintained an active interest in the Northern Territory and, in retirement, published a number of books on the history of Methodists and Presbyterians there.