[2] Koerner's first journalism job out of school was at U.S. News & World Report as a researcher and fact checker, he eventually became senior editor.
[1][3] Koerner left USN&WR to become a freelance writer in 2000, and was a regular contributor to The New Republic, Mother Jones, Harper's Magazine, Legal Affairs, Washington Monthly, and The Christian Science Monitor.
[4] In 2006, Koerner edited the anthology The Best of Technology Writing which was positively reviewed in California Bookwatch[5] and SciTech Book News.
[1][6] His first solo authored full length book, Now the Hell Will Start: One Soldier's Flight from the Greatest Manhunt of World War II, was published by Penguin Press in 2008.
The book looks at the causes of the epidemic, some of the more famous ones and follows in-depth the story of the longest-distance skyjacking in American history, involving Willie Roger Holder and Catherine Marie Kerkow, a young couple who took control of Western Airlines Flight 701 on June 2, 1972.