August Macke (January 3, 1887 - September 26, 1914) was one of the leading members of the German Expressionist group Der Blaue Reiter (The Blue Rider). He lived during a particularly innovative time for German art which saw the development of the main German Expressionist movements as well as the arrival of the successive avant-garde movements which were forming in the rest of Europe. Wikipedia
The definitive Wikipedia entry for August Macke. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/August_Macke