Paul Rand(August 15, 1914 – November 26, 1996) was an American art director and graphic designer.
By my first impression, Paul Rand is the inheritor of the Bauhaus style but not only modernism. Although he mainly learned by himself, the style of his design strongly displays the similarity towards Bauhaus school. His colour choice is simple and pure but not less in the attractiveness of vividness. His shapes and typography design are very geometric and solid as same as the Bauhaus.
I tried to find the connection between the Bauhaus and Paul Rand but cannot have a really trustable proof. Only a few uncertain information told that Paul Klee probably had some kind of communication with Paul Rand and caused Paul Rand having the trend of a Swiss-styled internationalism. This rumour maybe not true, but I think it still points out that Paul Rand having a very obviously international style that keeps influencing the world until today. This should be one of the reasons that his design can still have a sense of fashion.
Paul Rand, Subway Posters Score 
Paul Klee, Senecio, 1922
No matter if Paul Rand really had connected with some of the others famous or not, his style has a strong power which is not inferior to the other artists. His works dig deeply into the audiences’ cognition to extract their most naive view of the world. This must result from his self-taught experience. Some of his creations keep a childlike technique, such as colours are not considered, sort combination is random, different elements are put together by a very general reason.
I like this kind of natural part of his works. However, maybe because he made too much commercial design, a lot of his works are obviously distorted to ingratiate public aesthetics. This makes some of his works being boring at the look, not much in the behind meaning but just stopped at the standard appearance. A sense of repeating for me.