Katii O’Brien began her career in publishing as an intern at Candlewick Press in Boston, Massachusetts, where she fell in love with their graphic novel adaptations of various Shakespeare works and the Spider-Man and X-Men pop-up books. Her break into comics then came with a series of editorial internships at Marvel in New York City where she worked on titles such as Amazing Spider-Man, Avengers vs. X-Men, Venom, Daredevil, and Captain America, among many more. She then continued with freelance editing on projects such as the sci-fi anthology series Fearless Future before being hired as an Assistant Editor at Dark Horse Comics in Milwaukie, Oregon in 2015. As an assistant, she worked on many books, including Mike Mignola’s Hellboy, B.P.R.D., Abe Sapien, Chuck Palahniuk’s Fight Club 2, Geof Darrow’s The Shaolin Cowboy: Who’ll Stop the Reign?, and Richard Corben’s Spirits of the Dead. After a promotion to Associate Editor in 2017 she is now the lead editor on all books in the Hellboy universe, some of which include B.P.R.D.: The Devil You Know, Hellboy and the B.P.R.D., and Witchfinder, in addition to titles such as Joe Golem: Occult Detective, Conspiracy of Ravens, and Bedtime Games.