It is true that my books have had many publishers. There are a number of reasons for that.
Sometimes a particular book changes publishers. Poppy was first published by Orchard Books. The paperback was issued by Avon and then HarperCollins. Orchard Books was sold to Scholastic, and Scholastic issued a hard cover Poppy under their imprint. Then Scholastic sold Poppy to HarperCollins, and they issued the book in all its forms.
S.O.R. Losers was published by Bradbury Press. The Man Who was Poe was published by Orchard Books. The Christmas Rat was published by Atheneum. But the editor was the same person. When a writer works very well with a particular editor, and that editor changes the place where he/she works, it’s common for the writer to follow that editor to their new publisher.
I have worked with a number of publishers who no longer exist, such as Lippincott. The Fighting Ground was first published by Lippincott, which was then absorbed by HarperCollins, who still has it in print.
A book like The History of Helpless Harry was first issued by Pantheon. The book went out of print, but was later republished by Morrow.
What Do Fish Have to Do with Anything? is published by Candlewick. Scholastic Book Club editions will soon offer the book on their list.
It is confusing, but then the business of publishing is often confusing. Nevertheless, for just one example, though Poppy has had a number of publishers, it has always been the same book. In other words, sometimes it’s the publisher that is changing, not the author.