World War I Victoria Cross Recipient. He was educated at Fairleigh Grammar, Bathurst, St Leonards Superior Public School (North Sydney) and Sydney Technical College. He was employed as a quantity surveyor and after senior cadets in 1911–1912 enlisted in the part time 18th (North Sydney) Infantry being commissioned in 1913. On August 5, 1915 Wark was appointed to the 30th Australian Infantry Battalion AIF and embarked for Egypt with his unit in November. In February 1916, the 30th Battalion was allotted to the newly formed 5th Australian Division and Wark was promoted captain. The 5th Division reached the Western Front in June and fought the first Australian divisional action at Fromelles on July 19 where Wark was wounded. He returned to duty in November and served the remainder of the war with the 32nd Battalion being promoted major on April 27, 1917. Following the Battle of Polygon Wood on September 26, he commanded the front line for the following five days until the battalion was relieved. For his leadership and personal bravery during this period he was awarded the Distinguished Service Order. Wark was in temporary command of the 32nd Battalion in operations against the Hindenburg line that began on September 29, 1918. He moved ahead of his troops in the face of heavy fire, rushed a battery of 77 mm guns capturing four including ten of their crew and surprised and captured fifty Germans near Magny-la-Fosse. On October 1, he was fearless in the attack; without hesitation and regardless of personal risk he dashed forward and silenced machine guns which were causing heavy casualties. He was awarded the Victoria Cross. On May 31, 1919 he married Phyllis Marquiss Munro at Worthing, Sussex and returned to Australia where his appointment was terminated in September. He became a principal of Thompson & Wark, quantity surveyors and became involved in the community. He was divorced in 1922 and remarried to Catherine Mary Davis on December 10, 1927 at St Stephen's Presbyterian Church, Sydney. He rejoined the Regimental Reserve List of the 17th Battalion, Citizen Military Forces in 1935 and in April 1940 was appointed to the 1st Battalion assuming command on July 26 with the rank of temporary lieutenant-colonel. While on battalion exercises at Puckapunyal, Victoria, he died suddenly of coronary heart disease. He was survived by his wife, their son and two daughters.