He was the son of Hans Garmany Leeman and Kate Elizabeth Leeman of 6 Hartford Place, Armagh . In 1901 the family lived in house 27, The Mall, Armagh.
By 1911 the property was described as house 50, The Mall, Armagh. In the same year, Reginald Thackeray Leeman was boarding in house 15, New Row, Coleraine, Co. Londonderry. He is described as a Bank Clerk.
He was awarded the 14/15 Star, British War Medal and the Victory Star. His Medal Index Card records his correspondence address as 3 Victoria Street, Armagh.