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In page Sydney Hospital:

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It is unclear who prepared the design for the three Old Colonial Georgian buildings comprising the Sydney Hospital complex, but there were apparently many involved with its construction. There is speculation that both Governor Macquarie and John O'Hearen contributed to the design. John O’Hearen is probably the stronger contender for being the building's designer, for he not only defended the methods of its construction against critics but also signed himself as 'Architect' in related correspondence.[1]