Otl Aicher, also known as Otto Aicher (May 13, 1922 - September 1, 1991) was one of the leading German graphic designers of the 20th century.
Aicher may be best known for being the lead designer for the 1972 Munich Olympics. He created a new set of pictograms that paved the way for the ubiquitous stick figures currently used in public signs. [1] He also created the first official Olympic Mascot, a striped dachshund named Waldi (pictured above).

Here is his wiki.