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Rennie then attended Edinburgh University (1780-1783) and began work as an engineer, employed by Boulton and Watt for five years at mill building, and working under James Watt from 1783.
Rennie was also responsible for designing and building docks at Hull, Liverpool, Greenock and Leith and improving the harbours and dockyards at Portsmouth, Chatham and Devonport.
Rennie's last project was London Bridge, still under construction when he died in 1821 but completed by his son, also JohnRennie.