The New Adventures of Mary-Kate and Ashley is a 27-book series with 27 released primary works first released in 1998 with contributions by Nina Alexander, Francess Lin Lantz, Lisa Eisenberg, June Doolittle, Judy Katschke, Cathy East Dubowski, Carol Ellis, Melinda Metz, Alice Leonhardt, Jim Thomas, Mary-Kate & Ashley Olsen, Heather Alexander, Megan Stine, and Jacqueline Carroll.