Scottish civil engineer Thomas Telford had begun his career as a mason at 14, having lost his father in infancy. A self-taught architect, he was responsible for building many structures, including the Caledonian Canal and the Menai Suspension Bridge. Named The Colossus of Roads, he symbolized the Scottish Enlightenment.
John Rennie the Elder was a Scottish civil engineer considered a pioneer in the use of structural cast iron. He designed many bridges, canals, docks, and warehouses. As a young boy, he spent much time in the workshop of Andrew Meikle, a prominent mechanical engineer, and learned from him. He then went on to establish his own engineering practice.