Thomas Coleman was born in Carnteel, County Tyrone. In 1914 he was living in Hamilton, Scotland and joined the Army at Holytown, Lanarkshire. His first regiment was the Gordon Highlanders. He then transferred to the Machine Gun Corps In May 1917 Coleman was mentioned in dispatches. In July 1917 Sergeant Coleman was awarded the Military Medal. On 6 November 1917 Sergeant Coleman was killed at Passchendaele in the attack on the Polderhoek Chateau. It is believed that Sergeant Coleman was killed in command of the machine gun that was destroyed.
The Tyne Cot Memorial to the Missing forms the north-eastern boundary of Tyne Cot Cemetery, which is located 9 kilometres north east of Ieper town centre, on the Tynecotstraat, a road leading from the Zonnebeekseweg (N332). The names of those from United Kingdom units are inscribed on Panels arranged by Regiment under their respective Ranks. The names of those from New Zealand units are inscribed on panels within the New Zealand Memorial Apse located at the centre of the Memorial.