[1] Hack was by turns landing officer at Semaphore, harbormaster at Port Willunga, clerk with the Engineer-in-Chief's Department, railway storekeeper, timber merchant (with his sister-in-law Stella Ann Robin after the death of her husband Theophilus Robin), then valuer and architect.
[2] Hack was a judge at the Adelaide Jubilee International Exhibition in 1887, a member of the Central Roads' Board and the Fire Brigades' Board, a lay preacher for the Methodist Church and active with several Methodist organisations.
He was president of the Local Teachers' Association, the governing body of Prince Alfred College, chairman and treasurer of the Prisoners' Aid Society and an active member of the Chamber of Manufacturers.
[1] Theodore Hack married Elvira Louisa Ansell (c. 1842 – 7 October 1890) on 17 November 1864.
She married John Arthur Ballantyne (1873–1942) on 7 August 1907, lived in Wayville, South Australia.