People 7/20 July 20, 2023By Katy Hershberger Harper Collins Children's Associate editor and union steward Stephanie Guerdan was let go from the company. American Booksellers Association Ryan Quinn has been promoted to director of membership, succeeding Daniel O’Brien, who will depart on August 4. Mariana Calderón will join on July 25 as member relations and DEIA manager.