Brigadier Lewis Ernest Stephen Barker, CBE, DSO, MC (5 May 1895 – 13 December 1981) was a career Australian Army officer. He was born on 5 May 1895 in Mulgrave, Victoria, to parents Richard Barker and Edith Sibella Frances. He attended the Brighton Grammar School and the Royal Military College of Australia. After graduating, he became a lieutenant on 4 April 1916. He served in the 8th Field Artillery Brigade and later the 39th Battalion on the Western Front from 1916 to 1918, when he was transferred to the 12th Field Artillery Brigade and promoted to captain. For valiant actions, he received the Military Cross. In 1921, he married Alice Hope McEachern. He served in the army, and after various promotions took command of fortresses at Newcastle, New South Wales. In 1940, Barker took command