John Dickson Carr (1906?1977) was one of the greatest writers of the American Golden Age mystery, and one of the only American authors to be included in England's legendary Detection Club. Though he was born and died in the United States, Carr began his writing career while living in England, where he remained for nearly twenty years. Under his own name and various pseudonyms, he wrote more than seventy novels and numerous short stories, and is best known today for his locked-room mysteries. His beloved series character, Dr. Gideon Fell, was based on author G. K. Chesterton and appeared in twenty-four novels.

Otto Penzler is the founder and president of Penzler Publishers, which includes The Mysterious Press, Scarlet, American Mystery Classics, Crime Ink, and MysteriousPress.com. He is also the proprietor of The Mysterious Bookshop in New York City and is regarded as the world's foremost authority on crime, mystery and suspense fiction. He has won a Raven, the Ellery Queen Award, two Edgars (for the Encyclopedia of Mystery and Detection, 1977, and The Lineup, 2010), and lifetime achievement awards from Noircon and The Strand Magazine. He has edited more than 80 anthologies and written extensively about mystery fiction.