Thomas Augustin "Gus" O'Shaughnessy (1870-1956) was an Irish American Celtic Revival designer from Missouri who worked primarily in stained glass.
O'Shaughnessy, who was a member of Chicago's Palette and Chisel Academy of Fine Art,[1] is best remembered for having created the greatest examples of Celtic Revival architectural design in America.
O'Shaughnessy designed and installed 15 stained glass windows at Old St. Patrick's Church at Desplaines and Adams streets, in Chicago between 1912 and 1922 and executed the detailed interlace stenciling used throughout the interior.
[4] The central window of the triptych memorializes Irish patriot Terence MacSwiney, Lord Mayor of Cork, who died during a hunger strike protesting his internment by the British presence in Ireland.
According to the Encyclopedia of Chicago: ... [T]hanks to the genius of artist Thomas A. O'Shaughnessy, St. Patrick's was transformed, between 1912 and 1922, into the best-known example of Celtic Revival Art in America.