 An executive Building Committee was quickly formed to oversee the design and construction of the exhibition building, comprising accomplished engineers Isambard Kingdom Brunel and Robert Stephenson, renowned architects Charles Barry and Thomas Leverton Donaldson, the Duke of Buccleuch and the Earl of Ellesmere, and chaired by William Cubitt.By 15 March 1850 they were ready to invite submissions, which had to conform to several key specifications