Our goal at McDonald, Duncan LLP is to help you achieve your goals. We find solutions rather than create problems. The idea of preventative law, in terms of providing solutions before they can become problems, is a large part of how we think. Let us provide solutions for you. The law office of McDonald, Duncan LLP was founded by John McDonald and Bill Duncan in 1998. By then both partners had been serving the Cornwall and area community as partners in other firms for more than 20 years. Driven by confidence in the future of the City of Cornwall and the surrounding area, the firm’s strategy was growth. McDonald, Duncan LLP is now the largest law firm in the City of Cornwall and surrounding area with five lawyers and an articling student.