Architect. Born in Aberdeen, the son of another noted architect A. Marshall Mackenzie (1847 - 1933), Mackenzie had a prodigious talent fostered under the wing of his father. He was taking classes at Gray's School of Art at the age of ten and by fifteen was attending lectures at the University of Aberdeen. He travelled to the Continent and began work in an architectural practice in London with a friend of his father in 1901. His father set up a London office of his own practice and the young Mackenzie was nominally in charge, although the father was regularly in attendance. A notable early buildings in London was the Waldorf Astoria Hotel (1903). He joined the army during the First World War, but was badly injured and soon discharged. Despite his injury he was able to help his father with the designs for Australia House (1913-18). He was responsible for a number of War Memorials in NE Scotland in the early 1920s. Following the death of his father, Mackenzie became more involved with the Aberdeen practice and returned to the city in 1935. Mackenzie was responsible for bringing modern architectural styles to Aberdeen, including Jackson's Garage (1937) and the Northern Hotel (1938), both Art Deco, together with the International-style King's College Sports Pavilion (1939). In his later years he became involved with restoration work for the National Trust for Scotland.
He lived at Bourtie House and lies buried at Kirkton of Bourtie.