John Boyne is a Irish novelist. He is the author of 17 books for kids and adults. His books come in over 200 languages and his most famous is "The Boy in the Striped Pajamas".
John Boyne (born 30 April 1971) is an Irish novelist. He is the author of eleven novels for adults and six novels for younger readers. His novels are published in over 50 languages. His 2006 novel The Boy in the Striped Pajamas was adapted into a 2008 film of the same name.
i don't know if this is right but i think the answer is Feldman kept rigorous data on his business. Hope this helped:)