I’ve been publishing books since the early 1990s.

My newest nonfiction includes Networking for Systems Administrators, FreeBSD Mastery: Storage Essentials, Sudo Mastery, and Absolute OpenBSD, 2nd Edition. You also need my earlier books, like SSH Mastery, DNSSec Mastery, and Network Flow Analysis.

I also write fiction. That’s another site.

To get notified when a new book comes out, sign up for my fiction and nonfiction mailing lists.

I live by Detroit, am happily married, practice martial arts, and have pet rats.

Questions? Check my FAQ. Or read the autobiography pages, where I surrender my dignity. Repeatedly. Fortunately, dignity is a renewable resource.

I update this page after book releases. Want updates? Check my blog. Want really frequent and trivial updates? Check Twitter. Or look at my contact page.