Question: Who helped James Howe pen his best known children's book?

Context articles: Bernard H. Paul
Willy Pogany
Janet McDonald
Bunnicula (TV series)
Timm Thaler (novel)
James Howe
James H. McClure
Jane Thayer
Bunnicula
Steve Howe (musician)

Bernard H. Paul (April 22, 1907 – September 18, 2005) was a puppeteer best known for his traveling show and television broadcasts of "Paul's Puppets".
 His marionette show ran for 10 years on WBAL-TV in Baltimore.
 In 1931 he performed the first known children's television show.
William Andrew ("Willy") Pogany (born Vilmos Andreas Pogány) (August 24, 1882 – July 30, 1955) was a prolific Hungarian illustrator of children's books and others.
 His contemporaries include C. Coles Phillips, Joseph Clement Coll, Edmund Dulac, Harvey Dunn, Walter Everett, Harry Rountree, Sarah Stilwell Weber, and N.C. Wyeth.
 He is best known for his pen and ink drawings of myths and fables.
 A large portion of Pogany's work is described as Art Nouveau.
 Pogany's artistic style is heavily fairy-tale orientated and often feature motifs of mythical animals such as nymphs and pixies.
 He paid great attention to botanical details.
 He used dreamy and warm pastel scenes with watercolors, oil paintings, and especially pen and ink.
 Painstakingly detailed and confident, Pogany's pen and ink pieces portray the true extent of his talent.
Janet McDonald (August 10, 1953 – April 11, 2007) was an American writer of young adult novels as well as the author of "Project Girl", a memoir about her early life in the Brooklyn projects and struggle to achieve an Ivy League education.
 Her best known children's book is "Spellbound", which tells the story of a teenaged mother who wins a spelling competition and a college scholarship.
 The book was named as the American Library Association's Best Book for Young Adults in 2002.
Bunnicula is an American animated television series from Warner Bros.
 Animation developed by Jessica Borutski, produced by Borutski and Maxwell Atoms, and distributed by Warner Bros.
 Television.
 It premiered on Cartoon Network and Boomerang on February 6, 2016.
 It is loosely based on the children's book series by James Howe and Deborah Howe.
 The show is a dark comedy about a vampire rabbit named Bunnicula who likes carrot juice instead of blood to strengthen up his super abilities in new paranormal adventures.
Timm Thaler oder Das verkaufte Lachen (roughly translated as Timm Thaler, or the Traded Laughter and best known as simply Timm Thaler) is a 1962 children's novel by German author James Krüss.
 Regarded by the "Oxford Encyclopedia of Children's Literature" as Krüss' best known children's book, "Timm Thaler" tells the story of a boy who trades his enchanting laughter to a wealthy mysterious Mephistopheles-like Baron in exchange for the ability to win any bet he makes.
 Regretting the exchange, he undertakes a four-year journey to win his laughter back.
 In 1979, Krüss wrote a sequel novel, Timm Thalers Puppen oder Die verkaufte Menschenliebe (roughly translated as Timm Thaler's Puppets, or the Traded Love for Mankind).
James Howe (born August 2, 1946) is an American children's writer with more than 80 juvenile and young adult fiction books to his credit.
 He is known best for the Bunnicula series about a vampire rabbit that sucks the juice out of vegetables.
James Howe McClure (9 October 1939, Johannesburg, South Africa – 17 June 2006, Oxford, England) was a British author and journalist best known for his Kramer and Zondi mysteries set in South Africa.
Jane Thayer (the pen name of Catherine Woolley, August 11, 1904 – July 23, 2005) was an American writer.
 She is known best for the book "The Puppy Who Wanted A Boy", which became the basis of a 1980s Saturday Morning cartoon series, "The Puppy's Further Adventures".
 Jane Thayer wrote 86 books for children, many of which ("The Blueberry Pie Elf" and "The Puppy Who Wanted a Boy for Christmas") have become classics.
 She was so prolific that her editor suggested she publish some of her works under a pen name.
 Thus, Catherine authored picture books under the pen name of Jane Thayer, while writing books for older children and adults under her real name.
Bunnicula is a children's book series written by Deborah Howe and James Howe, featuring a vampire rabbit named Bunnicula who sucks the juice out of vegetables.
 Alternatively, "Bunnicula" is the main title of the first book in the series, published by Atheneum Books in April 1979.
 Deborah Howe died in 1978, months before the book first saw print.
 The series consists of seven books, with the latest published in 2006.
Stephen James "Steve" Howe (born 8 April 1947) is an English musician, songwriter and producer, best known as the guitarist in the rock band Yes across three stints since 1970.
 Born in Holloway, North London, Howe developed an interest in the guitar and began to learn the instrument himself at age 12.
 He embarked on a music career in 1964, first playing in several London-based blues, covers, and psychedelic rock bands for six years, including The Syndicats, Tomorrow, and Bodast.