who invented jelly beans gustav
David Klein, who invented Jelly Belly jelly beans, poses for photos in Covina, Calif., on Oct. 12, 2011. Klein has launched a Kickstarter campaign to produce caffeinated jelly beans. David Klein, who invented Jelly Belly jelly beans, poses for photos in Covina, Calif., on Oct. 12, 2011. Klein has launched a Kickstarter campaign to produce caffeinated jelly beans. Jelly Belly inventor David Klein says he made the biggest mistake of his life when he gave up the rights to his most famous creation.