Ninth House is a dark fantasy horror novel written by author Leigh Bardugo, published by Flatiron Books in October 2019.

Patricia Bean McConnell, Ph.D, CAAB Emeritus is an ethologist who consulted with pet dog and cat owners for over thirty years regarding serious behavioral problems, has given seminars on companion animal behavior both domestically and internationally, and has written several books on training and behavior relating to their dogs..

John Elliot Bradshaw was an American educator, counselor, motivational speaker, and author who hosted a number of PBS television programs on topics such as addiction, recovery, codependency, and spirituality.

Mieshelle Nagelschneider is an American cat behaviorist, author of the eponymously titled book The Cat Whisperer and founder of The Cat Behavior Clinic in Portland, Oregon..