Young & Mackenzie had it's origin in an architectural practice established by Robert Young (1822-1917) in Belfast, Ireland in the early 1850s. In 1866 or 1867 he took one of his pupils, John Mackenzie (1844-1917) into partnership at which point the practice became Young & Mackenzie. In 1880 Young's son, Robert Magill Young (1851-1925). Following the death of both his father and Mackenzie in 1917, he continued to run the practice, with the name unchanged, in partnership with his son, James Reid Young (1884-1967).
Presbyterian Churches in Belfast and throughout Ulster. Various schools, Including Belfast Royal Academy, the Presbyterian Assembly Hall Buildings; several Insurance blocks of offices, Including Scottish Provident Building, Ocean Accident and Guarantee Corporation, Ltd., both in Donegall Square. Many manses throughout Ulster; large shops and warerooms, Including Messrs. Robinson & Cleaver, John Fulton & Co., Ltd., Anderson & McAuley. Ltd., W. Dobbin & Co., Ltd., J. & J. Haslett, Ltd. Numerous private mansions and villas. The firm have been architects and civil engineers to various public bodies, and at present are engaged in work for Belfast Poor Law Guardians and Belfast Corporation. For both bodies they have erected large hospitals. [Source: Who's Who in Architecture 1914]
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Works:
Many Presbyterian churches, schools, and manses throughout Ulster; the Presbyterian Assembly Hall; Belfast Royal Academy; offices of the Scottish Provident Institution; and Ocean Accident and Guarantee Corporation, Ltd. Extensive warehouses in Belfast and Londonderry; many private mansions and houses; several large hospitals for Belfast Corporation, and various Poor Law authorities. [Source: Who's Who in Architecture 1923]
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For a detailed list of architectural projects by Robert Young and Young & Mackenzie from 1863 to 1960 see the Dictionary of Irish Architecture 1720-1940
Harron, Paul. Architects of Ulster: Young & MacKenzie – A Transformational Provincial Practice 1850-1960. Belfast Ulster Architectural Heritage Society, 2016. [ISBN 9780900457807]