Charles Rennie Mackintosh, a contemporary of Frank Lloyd Wright, is The Man around here. wiki: “Scottish architect, designer, water colourist and artist. He was a designer in the Arts and Crafts movement and also the main representative of Art Nouveau in the United Kingdom. He had considerable influence on European design. He was born in Glasgow and he died in London.”
He had a whole room in the museum and I saw some of his buildings on the street.