While I was unable to find out who created the Barbie Logo I did find that the creators of the actual doll were a couple named Ruth and Elliot Handler.  The toy itself has gained incredible popularity since it was first released to the public, but this is probably also due the to Logo and marketing of those selling the toy.  Despite changes through the years, the Barbie Logo has remained consisted in in design and color.  The Logo is usually seen in a font that looks very cursive, but it went through some alterations between 1975 and 1999 that were a bit thicker and boxier.  The logo is so recognizable that designers can rarely use these particular shades of pink in their designs because the viewer would most likely think of Barbie even if the logo itself has nothing to do with the doll.  Because of the consistency of font and design, the logo is easy to remember which is probably one of the reasons for Barbie's popularity among buyers.