Originated from Glasgow he studied at the Glasgow School of Art in architecture. One of his main beliefs was that artists shouldn't be held down and should be given greater freedom and independence.
Mackintosh explored a wide range of art areas from jewelry to furniture, textiles and architecture.
One of his more famous panels The Wassail
Some more of his more renowned work includes the library at the Glasgow School of Art and his type face.
There are a number of interesting books out about Mackintosh. Two I recommend are Charles Rennie Mackintosh Textile Dsigns by Roger Billcliffe and Charles Rennie Mackintosh by Alan Crawford.