London Traffic (as chair), the Electrification of Railways Advisory Committee and the Light Railways Investigation Committee (as chair). Additionally he was a technical adviser to the Treasury on civil engineering schemes financed under the Trades Facilities Act and he was transport representative for the ministry on the Forth Conservancy Board. In 1920 he was appointed Knight Grand Cross of the Order of the British Empire. Gibb founded his own firm, Sir Alexander Gibb & Partners, in 1922 after becoming a consulting engineer the year before. He was involved in a variety of projects worldwide, including Barking Power Station, the Galloway hydro-electric power scheme (both with Charles Hesterman Merz and William McLellan), the Kincardine Bridge, a study at the port of Rangoon and work at the Singapore Naval Base. In the 1930s the firm gained work in the industrial sector, including the Park Royal Guinness brewery. This led their engagement in 1939 to undertake the design and supervision of three ordnance factories for the Ministry of Supply, work which would continue throughout the Second World War. He also wrote The Story of Telford: The Rise of Civil Engineering, a biography of the Civil Engineer Thomas Telford, to whom his great-grandfather John Gibb had been a deputy. Outside of engineering, Gibb served as Vice-chairman of the Managing Sub-Committee of University College London, sat on the Education Committee of the London County Council and was a member of the Council and Executive Committee of Princess Helena College. Gibb became less involved with his firm after 1945 and died at his home in Hartley Wintney, Hampshire, on 21 January 1958. Honours In 1914 he was elected a Fellow of the Royal Society of Edinburgh. His proposers were John MacKay Bernard, Sir Thomas Hudson Beare, Ernest Wedderburn, and William Archer Tait. Gibb was elected a Fellow of the Royal Society in 1936 and was a member of a number of professional bodies, holding the presidencies of the Institution of Civil Engineers (1936–37), the Institution of Chemical Engineers (1927–28 and 1928–29), of which he was an original member, the Institution of Engineers-in-Charge (four times), the Institute of Transport, the Junior Institution of Engineers, the Institute of Welding (three times) and the London Chamber of Commerce & Industry. He was also chairman of the Association for Consultancy and Engineering and the first civil engineer appointed to the Royal Fine Arts Commission. Gibb received an honorary Doctor of