Career
During World World War II, Duncan served with the Submarine Surveillance Mine Sweeping Service in the Mediterranean and Aegean Seas. On his return from the war, he became a joiner for the Clan Lincolnshire and Stephen shipyards, whilst taking piping lessons in his free time. In 1974, he moved on to be a bagpipe instructor full-time at the College of Piping in Otago Street, Glasgow.
A position he held until 1978 when, he founded his own piping school in Robertson Street.
In his lifetime he would publish three books of traditional and modern pipe music and three solo albums. After his death the Duncan Johnstone Memorial Competition was set up by the National Piping Centre.