He was the son of James E N Morrison (Civil Servant) and Florence Mary Morrison of 21 Lansdowne Road, Belfast.
Morrison joined the Belfast Banking Company.
The 1901 Irish Census records a James E N Morrison (11) residing in house 5, Drumshannon, Killeevan, Monaghan with his grandmother, Eleanor Anne Nesbitt. There are no other Morrison's recorded.
The 1911 Irish Census records a James EN Morrison (21) boarding in house 22, Nelson Street, Inn's Quays, Dublin. His profession is a Correspondent in the Cycle Trade.