French civil engineer who designed and built many stone arch bridges throughout France. He is best known for his Pont de la Concorde bridge, which spans the River Seine in Paris. The original design, completed in 1772, was found too daring and was not constructed for nearly 15 years. Once started, Perronet let nothing keep it from completion, including the French Revolution. In fact, he even used some of the stone from the Bastille as a source of masonry for this bridge.