In his own words
I started at Clydebank as an apprentice in the shipyard drawing office in 1919, and spent several years in the general drawing office. Having graduated from the University of Glasgow in 1923, I was then transferred to the ship design office as a naval architect, and continued there until 1927, when I was seconded to an associate firm in Spain under the direction of a former Clydebank man.
I had two years in Spain as a designer, and as an estimator, coaching Spaniards. I returned to Clydebank where I was appointed Assistant Naval Architect. I served in that capacity from 1929 to 1949, which was a long haul. In 1949, I was made Naval Architect and Technical Manager in charge of the design and drawing office. From 1949 to 1959, I occupied that position, and then I was made Managing Director in succession to Sir James McNeil. I held that position until the end of 1963, when I handed over to John Rannie, with the idea that he would handle the construction of the Queen Elizabeth II.
I had actually supervised the design in conjunction with Cunard, and supervised the tender which was eventually accepted. Since I was approaching retirement age, I was made vice Chairman, with a consultancy role, and stepped out altogether in 1967.
Dr. John Brown, John Brown, Clydebank. (2013). In A. Slaven & H. Murphy (Eds.), Crossing the Bar: An Oral History of the British Shipbuilding, Ship Repairing and Marine Engine Building in the Age of Decline 1956–1990 (Research in Maritime History, pp. 43-46). Liverpool University Press.