• He was a prominent Freemason, and served in various high offices. He contributed generously to the erection of the Adelaide Masonic Temple. • He was interested in military matters: at 18 years of age he joined the first volunteer regiment raised in the Colony, and later transferred to the Adelaide Rifles. :In 1885 there was a fear that Great Britain and Russia would go to war, and when communication with Britain was interrupted due to a break in the submarine line, a scare arose that the Russians were about to invade. A. M. Simpson had his factory on a war footing, making electrically detonated submarine mines. He invented a trench periscope and mobile kitchens for use in the
Great War. In March 1916 he made a gift of £2,250 to the defence authorities, which was used to purchase an
F.E. 2B fighter plane. • He played a prominent part in the 1887
Adelaide Jubilee International Exhibition. • He was President of the
Royal Agricultural and Horticultural Society for two years. • He was a member of the first committee of the Australian National Union (the forerunner of the
Australian Natives' Association). • He was a trustee of the State Bank. • He was a member of the Board of Conciliation for many years. • He was in 1876, with
W. C. Buik,
David Murray and others, a founder of the Adelaide and Suburban Tramway Company. He succeeded Buik as chairman, which position he held until its dissolution, when its assets were taken over by the
Municipal Tramways Trust. • He was also for a long time on the boards of the Port Adelaide Dock Company and the
South Australian Gas Company. • He was a member of the Board of Governors of the
Adelaide Botanic Gardens from 1899 and also contributed in concrete ways: he funded the brick kiosk in the grounds and, with
R. Barr Smith the "boy and swan" fountain behind the palm house. • He was Treasurer of the
Adelaide Unitarian Christian Church,
Wakefield Street, from 1884 to 1900. • He was Treasurer of the South Australian Institute for the Blind and Deaf and Dumb, Brighton, from 1896. • He was a relatively strong chess player, taking part in the first Adelaide tournament in 1864. He helped found the
Adelaide Chess Club, and was its president from 1892. He underwrote the costs involved in bringing the English champion
J. H. Blackburne to Adelaide, whose fees alone were £25 (perhaps $20,000 in today's money). In a simultaneous game Simpson was the last to succumb to the champion, though the star of the evening was
Henry Charlick, who conducted two games, winning one and drawing the other; Blackburne's only reverses. • He was a good friend of the
St. John Ambulance Association • and was for a long time Chairman of the Kalyra Sanatorium for Consumptives, and the associated
Estcourt House. • He was for many years, and up to the time of his death, a member of the council of the South Australian branch of the
Royal Geographical Society of Australasia. • He was, with Richard Smith and W. H. Holmes, a founder of the first Commercial Travellers and Warehousmen's Association, forerunner of the Commercial Travellers' Association, and its secretary until 1873, when it was wound up, and its cash assets passed to the Benevolent and Strangers' Friend Society. • A. M. Simpson owned the land which later became Unley Shopping Centre. • The Eastwood Institute was made possible by his significant donation to the Unley Council. He suffered for a long time from defective eyesight, and died after some years suffering "a serious internal complaint", i.e. cancer. ==Legacy==