D.X. Ferris is the publisher of 6623 Press, which publishes unconventional books about pop culture, success, and other cool stuff. He is the author of the full-length Slayer biography, “Slayer 66 2/3: The Jeff & Dave Years.” His previous book, “Slayer’s Reign in Blood,” the first English-language book about the band, is part of Bloomsbury Academic/Continuum’s 33 1/3 series. His webcomic strip, “Suburban Metal Dad,” runs every Monday and Friday at Popdose. He is ’bout it.