Built at the dawn of the twentieth century, the Glasgow School of Art is the work of artist and architect Charles Rennie Mackintosh. Seen as one of the most prominent representatives of the Glasgow style, Mackintosh spent more than ten years to complete his masterpiece.Built at the dawn of the twentieth century, the Glasgow School of Art is the work of artist and architect Charles Rennie Mackintosh. Seen as one of the most prominent representatives of the Glasgow style, Mackintosh spent more than 10 years to complete his masterpiece.