DeWolf was named as co-author with Bent Corydon of the 1987 edition of a highly critical book about Hubbard and the Church of Scientology titled "L. Ron Hubbard, Messiah or Madman?". Prior to publication, he sued the publisher Lyle Stuart, claiming breach of contract, and that his contributions were misrepresented. He retracted his negative comments about Hubbard and the church in submitted court affidavits, in which he called the biography "inaccurate and false", and demanded to have his name removed from the book. He said he was denied the opportunity to review the book until it was already in print.