This thesis examines the history of the twenty stained glass windows at the Erskine and American Church, Montreal, attributed to the Tiffany Studios of New York (1879-1932); from their original installation in the American Presbyterian Church from 1897 to 1932, until their placement in the Erskine and American Church in 1938.  These windows are explored as part of the history of the American Presbyterian Church in Montreal, as memorials to some of the prominent members of the church, and as works of art created by the Tiffany company.