Question: Peter Brown was the protagonist in the 1931 book that was illustrated by whom?

Context paragraphs:
They Only Come Out at Night (Peter Brown song): They Only Come Out at Night is 1984 dance single by Peter Brown.  The single was his first number one on the dance chart, where it stayed for one week.  "They Only Come Out at Night", also peaked at number fifty on the soul singles chart, but unlike previous Peter Brown entries, it did not make the Hot 100.  It did, however, reach No. 102 on the "Billboard" Bubbling Under the Hot 100 chart.

Von Dem Alten Kloster: Von Dem Alten Kloster ("From an old monastery") is a 1931 book by Herman Solnik written in a Yiddish.  Published in Warsaw, the book contains legends and narrations related to Błaszki and the district of Kalisz.

Cory Wade (music producer): Cory Wade is a former American record producer and songwriter, known for producing some of the biggest hits in disco in the 1970s.  A producer for TK Records, Wade co-produced the 1977 single "Do Ya Wanna Get Funky With Me" by Peter Brown, which became the first 12-inch single to sell a million copies.  Wade also produced hit recordings for KC and the Sunshine Band, T-Connection, Foxy and made a comeback in the 1990s with a remake of Peter Brown's "Crank It Up" by Lawrence Leritz, released on Spectrum Records.  Residing in Horn Lake, Mississippi, Cory Wade is currently working on a 3D feature films

Curley Fletcher: Carmen William "Curley" Fletcher (18921954), also known as Curley W. Fletcher and Curley Fletcher, was an American composer of cowboy songs and cowboy poetry.  A prolific creator of this material, he is best remembered for the classic cowboy song "The Strawberry Roan", written in 1915, and for his 1931 book "Songs of the Sage".

The American Black Chamber: The American Black Chamber is a 1931 book by Herbert O. Yardley.  The book describes the inner workings of the interwar American governmental cryptography organization called the Black Chamber.  The cryptography historian David Kahn called the book "the most famous book on cryptology ever published."  By describing the inner workings of the organization, the book created large interest public awareness of the United States's cryptographic abilities.  In particular, the Japanese government became aware of the extent of experience the American government had with cryptography and increased the strength of their own knowledge in cryptography in response.  Reviewers suggested the book may have cost the United States significantly in the Pacific theater against Japan in World War II.

Pirates in Oz: Pirates in Oz (1931) is the twenty-fifth in the series of Oz books created by L. Frank Baum and his successors, and the eleventh written by Ruth Plumly Thompson.  It was illustrated by John R. Neill.

Herbert William Heinrich: Herbert William Heinrich (1886 – June 22, 1962 ) was an American industrial safety pioneer from the 1930s.  He was an Assistant Superintendent of the Engineering and Inspection Division of Travelers Insurance Company when he published his book "Industrial Accident Prevention, A Scientific Approach" in 1931.  One empirical finding from his 1931 book became known as Heinrich's Law: that in a workplace, for every accident that causes a major injury, there are 29 accidents that cause minor injuries and 300 accidents that cause no injuries.  Because many accidents share common root causes, addressing more commonplace accidents that cause no injuries can prevent accidents that cause injuries.

Tales of Tahitian Waters: Tales of Tahitian Waters is a 1931 book by Zane Grey.  The book collects several fishing stories and was first published by Harper Brothers and was later republished in 1990 by Derrydale Press.  In the book Grey describes catching a marlin weighing 1,040 pounds and the catch was credited as being the first 1,000 pound fish ever caught.

An Essay on Typography: An Essay on Typography is a 1931 book by Eric Gill about the history of typographical art and production, and its state in the 1930s when Gill was writing.  It has been considered a classic since its first publication: the influential graphic designer Paul Rand called it 'timeless and absorbing'.

Peter Brown (Oz): Peter Brown is a major character in the Oz novels of Ruth Plumly Thompson, who continued the series of Oz books after the death of their creator, L. Frank Baum.  Thompson used Peter as the protagonist in three of her books: "The Gnome King of Oz" (1927), "Jack Pumpkinhead of Oz" (1929), and "Pirates in Oz" (1931).

Supporting paragraphs: Peter Brown (Oz) Pirates in Oz
Answer: John R. Neill