Education
Mullan studied at Rossall School, then read law at the University of Cambridge, graduating in 1934.
Mullan studied at Rossall School, then read law at the University of Cambridge, graduating in 1934.
He joined the Royal Naval Volunteer Reserve in 1937 and was called up on the outbreak of World World War II, soon becoming a lieutenant. He served on HMS Rodney and HMS Lewes before becoming a Naval Liaison Officer with the Royal Norwegian Navy. At the Northern Ireland general election, 1945, Mullan unsuccessfully contested South Down for the Ulster Unionist Party.
However, he was elected to the Westminster Parliament at the Down by-election, 1946.
In 1948, he qualified as a solicitor. He was also promoted to Lieutenant Commander.
The Down was abolished in 1950, and Mullan did not stand for an alternative seat. In 1951, he left the Royal Navy.
In 1974, he served as Deputy Lieutenant of County Down, and in 1979 he was awarded the Commander of the Order of the British Empire.
38th United Kingdom Parliament]
He then became a member of the Ulster Unionist Council. He remained a member of the Ulster Unionist Council until 1960, when he became a magistrate.