Arup
Founded in 1946 by the consulting engineer Ove Arup, Arup's clients include today virtually every architectural practice of note.
Best known for its involvement with many of the high profile buildings of the post-war years, Arup has made a name for itself in many other aspects of engineering from roads and bridges to indestructible flasks for transporting nuclear waste.
Having grown rapidly over the last 30 years, Arup now has more than 6,500 people worldwide and an annual turnover exceeding £280M (US$470M).