In 1995, Howison and wife Sue Duncan started Dark Delicacies, a store devoted entirely to horror books, films and gifts.
[1] The store has also published a number of charity anthologies, including The Altruistic Alphabet and Conjuring Dark Delicacies (a horror-themed cookbook).
In 2005, Howison and co-editor Jeff Gelb published Dark Delicacies: Original Tales of Terror and the Macabre (Carroll and Graf), which included stories by Ray Bradbury, Clive Barker, F. Paul Wilson, Chelsea Quinn Yarbro, David J. Schow, Steve Niles, Roberta Lannes, Gahan Wilson, and more.
In January 2019, when Dark Delicacies was forced to relocate, film director Guillermo del Toro backed a fundraising campaign to save the bookstore.
In 2008 his short story The Lost Herd (originally published in the erotic horror anthology Hot Blood 12: Strange Bedfellows 2004) was purchased for the television series Fear Itself.