Krulos is the author of four non-fiction works, and often travels during his research and embeds himself with his subjects in order to provide a neutral portrait of events that unfold.

[8] Krulos' third book, Apocalypse Any Day Now: Deep Underground with America’s Doomsday Preppers (Chicago Review Press, 2019), involves examining the lives of survivalists.

[9] According to Skeptical Inquirer, the book's "tone is more breezy than scholarly" but "offers insight into the mentality of conspiracy theorists and doomsday prophets.

Believing Alex Jones' conspiracy theories about the Bohemian Grove involving child abuse and human sacrifice, McCaslin snuck into the private retreat campground and attempted it to burn it down on January 19, 2002.

In his spare time, Krulos works as a bartender,[16] conducts historic walking tours, and organizes the annual Milwaukee Paranormal Conference.