Charles Rennie Mackintosh was a Scottish architect and designer born in 1868 in Glasgow. He helped develop the "Glasgow Style" along with three other artists known as "The Four". Mackintosh designed notable buildings like the Glasgow School of Art and Hill House which featured his signature use of light, space, and details. He also designed furniture, metalwork, and graphic pieces that were influenced by Scottish traditions and Art Nouveau style. Mackintosh made important contributions to architecture before his death in 1928.