The Mott MacDonald Group is a management, engineering and development consultancy headquartered in the United Kingdom. It employs +18,000 staff in 150 countries. Mott MacDonald is one of the largest employee-owned companies in the world. It was established in 1989 by the merger of Mott, Hay and Anderson with Sir M MacDonald & Partners. History Mott MacDonald was formed in 1989 through the merger of Mott, Hay and Anderson and Sir M MacDonald & Partners. Mott, Hay and Anderson was a transportation engineering consultancy responsible for projects such as the London Underground while Sir M MacDonald & Partners was a water engineering consultancy with projects that included the Aswan Dam. The merger made Mott MacDonald one of the first international engineering, management, and development consultancies. Mott, Hay & Anderson Mott, Hay and Anderson was founded as a private partnership between Basil Mott and David Hay in 1902, with the original firm name of Mott & Hay. Prior to forming the original partnership, Mott and Hay had spent time building London tube railways and Hay had worked on the Blackwall Tunnel. Both engineers had worked together since 1888 on the City & South London Railway under Sir Benjamin Baker and James Henry Greathead. Early projects included the reconstruction and extension of the City and South London Railway (C&SLR), the building and extension of the Central London Railway, the construction of lifts beneath St Mary Woolnoth church at Bank tube station, the underpinning of Clifford's Tower, the reconstruction of Southwark Bridge and the widening of Blackfriars Bridge. Mott and Hay employed a young engineer called David Anderson as resident engineer for the latter project. The firm also advised on proposals for underground railways in Sydney, Africa, and Russia. David Anderson was made a partner in 1920 after returning from army service. The firm was thereafter known as Mott, Hay and Anderson. During the 1920s, it designed the rolling bridge over the River Dee at Queensferry, the Tyne Bridge in Newcastle and the Trent Bridge in Nottingham. It also designed the enlargement of the City & South London Railway tunnels and their extension past Camden Town and Clapham South to form the Northern line of the London Underground. Both founding partners died in 1938, at which time most of the construction projects stopped. During the 1940s after World War II, it began expanding and working on additional projects, some of which including repairing