from http://www.selectism.com/2012/11/08/the-playboy-cars-of-1965-by-illustrator-ben-denison-vintage-look/ via http://todaysinspiration.blogspot.com/2013/11/ben-denison-in-his-own-words-part-5.html
he did a lot of illustrations, for Playboy, whom he was fortunate to start working with from issue one, to Houghton Mifflin's grade school books
the above two from http://todaysinspiration.blogspot.com/