Sylvia Branzei (she/her) is the author of Grossology, Grossology and You, and more. She is the originator of grossology, or the idea of teaching science through gross things. Before devoting her life to grossness, Sylvia was a K–12 science teacher at a remote school in Mendocino County, California. She authored several articles that appeared in The Science Teacher, Science Scope, Partners in Education, and Creation Spirituality.

Jack Keely (he/him) has illustrated over thirty children’s books, including Sylvia Branzei’s notorious number one bestseller, Grossology (and its many sequels). The Los Angeles Times said "Jack Keely's wonderful illustrations…perfectly capture the charming, slightly subversive attitude of the enterprise." Jack is the illustrator and coauthor of The Whistlebrass Horror, The Whistlebrass Storm Watcher, and The Whistlebrass Clock People.