John Lloyd Williams was an engineering apprentice at Harland and Wolff in Belfast where he began a life-long friendship with Harry Ferguson. He served in the Royal Flying Corps during the First World War, and in the Royal Air Force during the Second, before dying in a road accident in 1940. He was a director of Harry Ferguson Ltd and was involved in the development of hydraulic control systems for tractors
From the guide to the Letters and papers of John Lloyd Williams, mainly relating to his service with the Royal Flying Corps in the First World War and his business connections with Harry Ferguson Ltd., 1914-1975, 1914-1975, (GB 206 Leeds University Library)