Quadrivium Supplies, Inc. is owned by Catherine Diedrich, who has studied hermeticism and folk magic for about 30 years. Catherine has a BA in English Literature and a Masters in Library and Information Science, started a PhD in Educational Administration before coming to her senses, and still doesn't know what she wants to be when she grows up. In the previous 25 years, she's worked for database companies and Big Five consulting companies, as a professional proofreader and editor, as a project manager for a tech company, and as a researcher for a political lobbying group. Quadrivium Supplies was born when Catherine decided to take the oils she made for herself and friends, and make them available to the public. Her work is supplemented by that of a talented astrologer, a diviner or two, a herbalist, and other practitioners who've assisted with the development of the company.

Catherine is married, has two daughters, three cats, and lives on the north side of Chicago. She collects grimoires, likes to argue about theology, and eyes the short distance between herself and the age of 50 with concern.