He later held senior resident posts in Bradford and Bristol, and worked in London.
In 1912 he returned to Aberdeen where he became assistant professor of medicine under Sir Ashley Mackintosh.
He was sent to Salonika in 1916 as the officer-in-charge of the medical division of the 43rd General Hospital.
[1] After demobilisation he returned to his prewar position in Aberdeen, before being appointed the first professor of medicine at the University of Cape Town.
His son, also named Arthur Wellesley, was the Medical Superintendent at Groote Schuur Hospital.