Rosen's published works include Lobster Boy about the murder of Grady Stiles. Rosen gave evidence in the trial against the killer.
His two books for HarperCollins in 2007, There But For the Grace: Survivors of the 20th Century’s Infamous Serial Killers and When Satan Wore a Cross, were best-sellers at the Doubleday Book Club, Literary Guild, Mystery Guild, and Book-of-the-Month Club. He has written other works of historical non-fiction including Cremation in America, Contract Warriors and Gold!.
In 2016, his book Murdering the President: Alexander Graham Bell and the Race to Save James Garfield was released by Potomac Books.