William James Adair Nelson, the elder son of H. Adair Nelson who was the original manager of His Majesty's Theatre, Aberdeen, was educated at Aberdeen Grammar School (1914-24). On leaving school he was apprenticed to chartered accountants Williamson & Dunn, qualifying with distinction in 1930 when he took up a series of appointments with London accounting firms, followed by five years in Colombo working for Ford, Rhodes & Thornton. He served in the Royal Artillery in the Middle East during WWII. In 1946 he was appointed Finance Inspector to the Ministry of Food in Colwyn Bay, later becoming Finance Officer to the National Coal Board. In 1948 he was appointed Treasurer and Assistant Secretary at Aberdeen University where he remained until his retirement in 1975. During his five years in Sri Lanka he developed an interest in castles and artillery fortifications and after his retirement he wrote _Dutch Forts of Sri Lanka_ published in 1984. He then went on to study Fort Jesus at Mombasa and his book of the same name was published posthumously in 1994. Nelson was an active member of the Fortress Study Group for which he wrote many articles.