Background
He was born Walter Johnston in 1863 in Kingstown (now Dún Laoghaire), County Dublin, Ireland.
He was born Walter Johnston in 1863 in Kingstown (now Dún Laoghaire), County Dublin, Ireland.
He was Chief Commissioner of the Dublin Metropolitan Police from 1915 to 1923. He later changed his name by deed poll to Edgeworth-Johnstone. He was commissioned a lieutenant in the Royal Irish Regiment on 25 August 1886, and promoted to captain on 5 April 1893.
In February 1900 he was appointed to act temporarily as Assistant Inspector of Gymnasia at Aldershot.
He was Chief Commissioner of the Dublin Metropolitan Police from 1915 to 1923. He was named a Companion of the Order of the Bath in the 1918 New Year Honours.
He was invested as a Knight Commander of the Order of the British Empire in 1924, and promoted to lieutenant-colonel. In 1897, Edgeworth-Johnstone married Helen Gunning Walker Waters.
He died 4 January 1936 in Regent"s Park Terrace, London.