Jean de Brunhoff
Jean de Brunhoff was the author of all the original Babar stories. His son, Laurent, succeeded his father, writing further Babar stories.
Adam Gopnik had an excellent article in the September 22, 2008 New Yorker, Freeing the Elephants.
Article in the December 16, 2004 edition of the New York Review of Books reviewing the entire Babar oeuvre by Jean de Brunhoff and his son, Laurent de Brunhoff.
This site relates the story of how Jean de Brunhoff came to write the story of Babar.